Computer name keeps changing after Yosemite install

My iMac keeps getting into some sort of conflict with itself that causes it to rename itself.
It's normally "Pajundrum's iMac". A morning or two after installing Yosemite, I got a message on my iPhone that my Apple ID was being used on a new device, "Pajundrum's iMac (2)". I can go into the System Preferences->Sharing and reset the name, but if left it will keep incrementing itself.
If I'm using the computer when it happens, I get a message stating, "Another device on the network is using your computer’s IP address."
This is the only iMac on the network. It is only connected to the network one way (through WiFi).
I've tried reseting my router, but that didn't seem to affect anything. Does anyone know what could be causing this, or how to resolve it?

Regarding to this, there're two different solutions how-to fix this issue:
Go to System Preferences -> Energy Saver. Select "Power Adapter" and then uncheck "Wake for network access".
Go to Macintosh HD > Library > Preferences > SystemConfiguration and delete the following files:
com.apple.airport.preferences.plist
NetworkInterfaces.plist
preferences.plist
and reboot after. They'll be recreated correctly after that.

Similar Messages

Keeps crashing after Yosemite install - Need thoughts on what to do...

My 2013 Macbook Air keeps crashing after Yosemite install, time between crashes are more random than consistent and it can be anytginh from one hour to 6 hours between crashes. Enclosed the report below with the hope that someone has some tips on what to do here.... I've formatted the computer, reinstalled the OS and checked the drive for errors and I've found nothing so far.
Would be very grateful for any thoughts/tips on what to do here...
Anonymous UUID:       BEEFE0EB-6E39-4774-2F21-C8DB361123F7
Tue Oct 21 23:43:49 2014
*** Panic Report ***
panic(cpu 0 caller 0xffffff8007d7a590): "a freed zone element has been modified in zone kalloc.1024: expected 0xdb989f771eb1bbd8 but found 0x60002, bits changed 0xdb989f771eb7bbda, at offset 0 of 1024 in element 0xffffff8018915c00, cookies 0x3f0011f6db804ed8 0x5352198c01c0537"@/SourceCache/xnu/xnu-2782.1.97/osfmk/kern/zalloc.c:496
Backtrace (CPU 0), Frame : Return Address
0xffffff81102c32d0 : 0xffffff8007d3a811
0xffffff81102c3350 : 0xffffff8007d7a590
0xffffff81102c33c0 : 0xffffff8007d79c17
0xffffff81102c3400 : 0xffffff8007d78de7
0xffffff81102c3530 : 0xffffff800813160e
0xffffff81102c36d0 : 0xffffff800812aab9
0xffffff81102c3760 : 0xffffff8008140ccf
0xffffff81102c3930 : 0xffffff8007f3f2f8
0xffffff81102c3a10 : 0xffffff8007f3ea95
0xffffff81102c3b40 : 0xffffff8007f52005
0xffffff81102c3b90 : 0xffffff8007f62505
0xffffff81102c3d90 : 0xffffff8007f56d87
0xffffff81102c3f50 : 0xffffff800824dcb2
0xffffff81102c3fb0 : 0xffffff8007e3ac46
BSD process name corresponding to current thread: PhotoStreamAgent
Mac OS version:
14A389
Kernel version:
Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64
Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61
Kernel slide:     0x0000000007a00000
Kernel text base: 0xffffff8007c00000
__HIB text base: 0xffffff8007b00000
System model name: MacBookAir6,1 (Mac-35C1E88140C3E6CF)
System uptime in nanoseconds: 16215962667183
last loaded kext at 9812882932706: com.apple.filesystems.smbfs 3.0.0 (addr 0xffffff7f8a0e1000, size 389120)
last unloaded kext at 1736098368348: com.apple.driver.AppleUSBCDC 4.2.2b5 (addr 0xffffff7f895e6000, size 16384)
loaded kexts:
com.apple.filesystems.smbfs 3.0.0
com.apple.driver.AppleBluetoothMultitouch 85.3
com.apple.iokit.SCSITaskUserClient 3.7.0
com.apple.iokit.IOBluetoothSerialManager 4.3.0f10
com.apple.driver.AudioAUUC 1.70
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.driver.AGPM 100.14.37
com.apple.driver.ApplePlatformEnabler 2.1.0d1
com.apple.driver.X86PlatformShim 1.0.0
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleIntelHD5000Graphics 10.0.0
com.apple.driver.AppleHDA 266.5
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleLPC 1.7.3
com.apple.driver.AppleThunderboltIP 2.0.2
com.apple.driver.AppleBacklight 170.4.12
com.apple.driver.AppleUSBEthernet 2.4.7
com.apple.driver.AppleHV 1
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.driver.AirPort.Brcm4360 900.19.8
com.apple.driver.AppleCameraInterface 5.23.0
com.apple.driver.AppleMCCSControl 1.2.10
com.apple.driver.AppleIntelFramebufferAzul 10.0.0
com.apple.filesystems.autofs 3.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.AppleUSBHub 705.4.1
com.apple.driver.AppleTopCaseHIDEventDriver 46.2
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.5
com.apple.driver.AppleAHCIPort 3.0.7
com.apple.driver.AppleUSBXHCI 705.4.14
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleSmartBatteryManager 161.0.0
com.apple.driver.AppleACPIButtons 3.1
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 3.1
com.apple.driver.AppleAPIC 1.7
com.apple.nke.applicationfirewall 161
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.IOBluetoothHIDDriver 4.3.0f10
com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.0
com.apple.iokit.IOUSBMassStorageClass 3.7.0
com.apple.iokit.IOSurface 97
com.apple.driver.DspFuncLib 266.5
com.apple.kext.OSvKernDSPLib 1.15
com.apple.iokit.IOAudioFamily 200.6
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.driver.AppleHDAController 266.5
com.apple.iokit.IOHDAFamily 266.5
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.iokit.IOBluetoothFamily 4.3.0f10
com.apple.iokit.IO80211Family 700.52
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOSerialFamily 11
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.IOPlatformPluginFamily 5.8.0d49
com.apple.driver.AppleSMBusController 1.0.13d1
com.apple.AppleGraphicsDeviceControl 3.7.21
com.apple.iokit.IOAcceleratorFamily2 156.4
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.kext.triggers 1.0
com.apple.iokit.IOUSBUserClient 705.4.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.0
com.apple.driver.AppleUSBMergeNub 705.4.0
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com.apple.driver.CoreStorage 471
com.apple.driver.AppleHIDKeyboard 175.5
com.apple.driver.AppleHSSPIHIDDriver 26.2
com.apple.driver.AppleMultitouchDriver 260.30
com.apple.iokit.IOAHCIFamily 2.7.0
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com.apple.iokit.IOThunderboltFamily 4.2.1
com.apple.driver.AppleHSSPISupport 26.2
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com.apple.driver.AppleIntelLpssDmac 2.0.45
com.apple.driver.AppleIntelLpssGspi 2.0.45
com.apple.iokit.IOUSBFamily 705.4.14
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com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
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com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 389.1
com.apple.iokit.IOStorageFamily 2.0
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 3.1
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.Libm 1
com.apple.kec.corecrypto 1.0
com.apple.kec.pthread 1
Model: MacBookAir6,1, BootROM MBA61.0099.B16, 2 processors, Intel Core i7, 1.7 GHz, 8 GB, SMC 2.12f143
Graphics: Intel HD Graphics 5000, Intel HD Graphics 5000, Built-In
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x483943434E4E4E384A544D4C41522D4E544D
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x483943434E4E4E384A544D4C41522D4E544D
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x117), Broadcom BCM43xx 1.0 (7.15.124.12.8)
Bluetooth: Version 4.3.0f10 14890, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM0512F, 500,28 GB
USB Device: My Passport 0824
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Air, Apple Inc., 23.6

Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Lion, Mountain Lion, or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.

MacBook Computer Name Keeps Changing

Recently my Mac computer name keeps changing. It's the normal name, but with a number at the end that keeps incrementing. How can I stop this?
I'm not sure if it's something to do with the fact I had a partition for the public OS X Yosemite, which I have now deleted.
Any ideas? Thanks.

I was having the same problem for awhile, even contacted support so they could screen share and see what I meant.
What I ended up doing was correcting the name and then unchecking all the boxes in Sharing. Open up Airport Utility and reset the router (basically I changed my password only because that's the easiest way to make it update). Go back into Sharing and recheck the sharing options that you had previously. Viola!
So far it's been a week now and my computer name has not changed. Hope this helps

My computer is running slow after Yosemite install -but in the Mail program, when I open an email and then open the attachment -all is good -when I close the attachment the Mail program goes away, and I have to reopen it in my Dock -every time -been

My computer is running slow after Yosemite install -but in the Mail program, when I open an email and then open the attachment -all is good -when I close the attachment the Mail program goes away, and I have to reopen it in my Dock -every time.

I tried this, but no luck. I went to Previous System>Users. There is nothing inside the "Users" folder, so I hit a dead end.
I can find my new e-mails -- those that came in since I re-installed the system -- in my NEW system (which I did to see if I was correctly understanding the advice), by going to Users>Home>Library>Mail>POP account name>Inbox.
Let me add a new question: I am running PhotoShop C3. It opens OK, and I can use it, but when it opens I get this message: "One or more files for Adobe Application Support folder are missing. Please re-run the PhotoShop installer."
I don't like re-installing working programs if I can avoid it, because it always seems to lead to other issues. Any idea what files are missing, and where it/they might be in the Previous System folder?
thanks
Mike

My iMac's computer name keeps changing automatically after Yosemite upgrade

This started happening once I upgraded my iMac to Yosemite. It will add numbers to the name of my iMac.
Example: It starts off as say "My iMac"
Then a half day later, it changes to "My iMac (2)"
Then the next day it will be "My iMac (3)"
And if I open the Finder window, it will show "My iMac" and "My iMac (2)" under "Shared" but if you click on them, nothing happens.
When I go to System Preferences > Sharing the computer name will have the number there "My iMac (3)" and say it can be found as MyiMac-3.local
If I change it back to just "My iMac", the number process starts all over again. I even tried naming the iMac something it was never named before and the same process occurs with the adding of the numbers.
Anyone know how I can fix this?

Have had the same issue with an iMac and MacBook Pro, both with Yosemite (MacBook upgraded from the Yosemite public beta). Both previously had Mavericks, and at one time or another would have had both Ethernet cable and Wifi on. This issue has only occurred since the upgrade to Yosemite. I do not use iCloud, so I believe that may be irrelevant and merely coincidental.
The solution provided by an Apple Care rep seems to have resolved the issue. Has stuck now on both machines for the last few hours. Time will tell for certain, but here's what we did:
- in System Preferences > Sharing, remove the (2) [or whatever is extra; mine was iMac (2), so I removed the (2)
- exit Preferences
- shutdown
- restart machine in Recovery mode (machine off, press and hold Command + R, power on, when Apple logo appears release keys)
- may take a few minutes to boot (depends on machine generation/speed, RAM and such)
- open Disk Utility
- select the OS disk (mine was Macintosh HD; selected the 'indented' item)
- run Verify Disk Permissions
- when finished run Repair Disk Permissions
- restart
On the MacBook I tried turning on Wifi and so far so good.
Banish the deux!

Why does the local network and computer name keep changing?

After upgrading to Yosemit the local network name and computername on my iMAC keep changes link:
Mycomputer-1
Mycomputer-2
Mycomputer-3
Why?
I have tried to change it back in sharing and network locations.
Is this also the reason the my iPhone cannot find my iPhone often cannot find my iMac when I will sync it? Then I have to restart the iPhone and iTunes on the computer. This happens very very often.
Maybe it also linked to these errors which the log is full of - many every minute:
19/10/14 12.11.09,522 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:256
19/10/14 12.11.09,543 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12856
19/10/14 12.11.09,561 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:0
19/10/14 12.11.09,565 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:44032
I think the is some bug/clash between bonjour and other network protocols. That is only a guess.

After resetting the computer name and local host name to the correct name without the number I also shotdown my iMac, my AppleTV, my iPhone, my iPad and then rebooted my Airport/Time capsule it seemed to work at least for several days. But yesterday I discovered that my Apple TV now also has changed name to Apple TV (2).
I logged into iCloud.com to see my devices and here it was really wired. My Apple TV was called Apple TV (2) and my iMac also had (2) after the name. Then I checked it on the iMac but here it was correct! Why can it have one name on the iCloud and another on the computer.
I restarted both the iMac, Apple TV and Airport Time capsule then everything was correct also on iCloud.com.
But today the iMac was called the name (2) again on the iMac. And now the local host name also had -2 after the name. It has not always been both names that has changed. That is really wired. And today Wifi was not working on the iMac after wake from sleep. I changed the name back and rebooted again also the Airport Time capsule. Now it is working again.
The log is still full of this messages:
02/11/14 19.22.13,186 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:1901
02/11/14 19.22.25,738 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:34051
02/11/14 19.22.25,758 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12342
02/11/14 19.22.25,900 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:34051
02/11/14 19.22.25,919 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:1901
02/11/14 19.22.27,636 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28772
02/11/14 19.22.27,683 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:27693
02/11/14 19.22.27,714 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28533
02/11/14 19.22.49,833 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:29281
02/11/14 19.22.49,866 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28528
The name is not the only problem. Often itunes will not find my iPhone and iPad. Then i need to close iTunes and restart the iPhone and iPad then it works for some time.
And the iPhone and AppleTV will not always wake the iMac from sleep. I am wondering if the is linked to the changing of name.
I have seen by googling that it can be related to a sleep proxy problem so it seems like that here is two devices on the net with the same name that is why name is changing, but to know this do not help me to solve the problem. I have also seen all the suggestion to turn almost every services off on the computer, but again I it is not a solution and I have the iMac and devises to use the functionality not to shot everything down. So I do not really understand people saying turn off itunes, turn off blueboth, and turn off this and that.
Apple must soon come with a real solution. We are really many people have these problem since we upgraded to Yosemite and iOS 8.
I have also listed some of the iTunes errors from the log below:
02/11/14 19.24.48,160 com.apple.xpc.launchd[1]: (com.apple.quicklook[1364]) Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook
02/11/14 19.24.52,279 Console[1368]: Failed to connect (_consoleX) outlet from (NSApplication) to (ConsoleX): missing setter or instance variable
02/11/14 19.25.06,907 iTunes[480]: Entered:_AMMuxedDeviceDisconnected, mux-device:5
02/11/14 19.25.06,908 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:5
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Mux ID not found in mapping dictionary
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Can't handle disconnect with invalid ecid
02/11/14 19.30.19,234 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
02/11/14 19.30.22,192 soagent[429]: Can't allocate SOHelper <SOMessageHelper: 0x7f9053a102c0> inside com.apple.soagent
02/11/14 19.30.54,871 iTunes[480]: Entered:_AMMuxedDeviceDisconnected, mux-device:6
02/11/14 19.30.54,871 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:6
02/11/14 19.30.54,871 iTunes[480]: tid:1a23b - Mux ID not found in mapping dictionary
02/11/14 19.30.54,871 iTunes[480]: tid:1a23b - Can't handle disconnect with invalid ecid
02/11/14 19.32.06,137 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.

My Computer Name Keeps Changing

I system preferences sharing where you go to set your computer name I am noticing that mine says "Rob's iMac (3)" instead of "Rob's iMac". My network hasn't changed, haven't added or removed anything. I am using an airport extreme. One thing I remember is that every once in awhile I will get an odd prompt trying to connect to the wi fi related to this but I can't remember. But the annoying thing right now is that the OS will not allow me to go back and take that "(3)" off. Does it have anything to do with VMware and Windows 7 running on my system? It almost seems like the airport extreme thinks there are now three iMacs on the network......... thx in advance....

I have exactly the same problem. There is one Mac on my network, WiFi is off on the Mac, the other machines are Windows 7 computers. The renames are completely random, sometimes even after waking from sleep. It's Lion that doesn't keep track and it's annoying the **** out of me.
My trusty Snow Leopard white iMac blew itself up (literally) two weeks ago so I was forced onto Lion. It's the worst OS X I've ever used - never had to google so often for workarounds and fixes (scrolling direction, hidden user Library, problems with Mail, keyboard mapping, the list goes on and on...)
If Mountain Lion fixes the renaming issue it might be worth the upgrade.

Computer Name Keeps Changing

In the system preferences sharing where you go to set "Computer name" I am noticing that mine says "iMac (3)" I have changed it back but keeps renaming the name "iMac (1),iMac (2), iMac (3) and so on,,, ". My network hasn't changed, haven't added or removed anything. This Only happens when System goes to sleep. Any Help on this???

I had the same problem. I solved it. I use an Apple Airport Extreme. I had connected my computer to the Airport Extreme using an ethernet cable and I also activated WiFi on my computer. My computer kept changing names. To correct this i deactivated WiFi on my computer, connecting to the internet only through the ethernet cable attached to the Airport Extreme. No more name changing.

Computer name keeps changing by integer Name (2)

My 2011 i7 iMac running 10.7.4, regularly changes the computer name. Always when rewaking it from sleep, the "Name" becomes "Name (2)". It claims "the name is already in use on this network". And this assertion is most certainly false. A quick search informs me this issue has existed since 10.5.8; I am experiencing it on 10.7.4 so I have to assume the cause has not been investigated or not found (or both).
Since the issue seems linked to Shared Resources I am going to try not sharing anything from this iMac from now going forward to see if this ends the behavior.
Whats really iritating about this is that the System Preferences > Sharing panel has a Lock on it that is *supposed* lockout changes to the settings under it. But the system is bybassing that lock mark and changing something without asking. Not okay.

I have been having the same problem ever since updating to 10.7.4. I have read of other people having this problem too, without resolution, so I presume it to be an Apple bug that will get ironed out in the next update.
Hope this helps

My computer is INCREDIBLY slow after Yosemite install

I recently installed the latest operating system Yosemite for my Apple Mac Pro and ever since it has been installed, my computer has been INCREDIBLY slow! Everything from starting up to applications opening to the **** internet! I'm ready to punch my fist into my **** monitor, even though I know it's not my monitor's fault. lol. Macworld has published an article (http://www.macworld.com/article/2837811/bugs-and-fixes-solving-a-yosemite-post-i nstall-disaster.html) about this along with the problem they think is causing it but I checked and the file in question doesn't exist on my computer. I don't want to go through the last step that is mentioned which involves downloading Yosemite onto an external hard drive and then installing from there. That step would also involve manually searching for files that might be causing the issue.
So, has anyone else experienced their computers running REAL slow after the update and did you figure out a simple solution?

Activity Monitor - Mavericks also Yosemite
Activity Monitor in Mavericks has significant changes
Performance Guide
Why is my computer slow
Why your Mac runs slower than it should
Slow Mac After Mavericks
Things you can do to resolve slowdowns see post by Kappy
Try running this program and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read.
Etrecheck – System Information

Local network computer name keeps changing

I haven't been able to work out why my iMac has bouts of telling me that my computer's name is already in use on the network and adding a number to it. I keep having to go into System Preferences/Sharing and change it back again so that my husband can use the shared printer. My husband has an iMac and MacBook on the same network. I also have an iPad.
It's a wireless network with a Thomson router.
Any ideas gratefully received!

Margaret,
Sounds like your computer is still registered on the network when logging in.
Try this setting: System Preferences > Network > Click Airport on the left > click Advanced.. bottom right > Airport tab > Check "Disconnect when logging out". > click OK.
See if that helps.
Regards,
Captfred
Message was edited by: captfred

Very slow computer with all apps after Yosemite install

I'm attaching the EtreCheck in order to get some help. Thanks.
Problem description:
Very slow launch of applications with Yosemite
EtreCheck version: 2.1.2 (105)
Report generated 15 de diciembre de 2014, 19:28:26 GMT+1
Hardware Information: ℹ️
MacBook Pro (15-inch, Late 2011) (Verified)
MacBook Pro - model: MacBookPro8,2
1 2.2 GHz Intel Core i7 CPU: 4-core
8 GB RAM Upgradeable
BANK 0/DIMM0
4 GB DDR3 1333 MHz ok
BANK 1/DIMM0
4 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 512 MB
AMD Radeon HD 6750M - VRAM: 512 MB
Color LCD 1920 x 1080
HP 2311x 1920 x 1080 @ 60 Hz
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 0:22:35
Disk Information: ℹ️
APPLE HDD HTS727575A9E362 disk0 : (750,16 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 748.93 GB (83.02 GB free)
Core Storage: disk0s2 749.30 GB Online
MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Western Digital My Passport 0748 2 TB
S.M.A.R.T. Status: Verified
disk2s1 (disk2s1) <not mounted> : 210 MB
Mi Passport (disk2s2) /Volumes/Mi Passport : 2.00 TB (121.89 GB free)
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Anywhere
Adware: ℹ️
Geneio [Remove]
Kernel Extensions: ℹ️
/Library/Application Support/Roxio
[not loaded] com.roxio.TDIXController (2.0) [Support]
/Library/Extensions
[loaded] at.obdev.nke.LittleSnitch (4228 - SDK 10.8) [Support]
[not loaded] com.microsoft.VirtualPC.Networking.1040 (7.0.2) [Support]
[not loaded] com.pgp.iokit.PGPdiskDriver (9) [Support]
[not loaded] com.pgp.kext.PGPnke (1.0.0) [Support]
/System/Library/Extensions
[not loaded] com.elgato.driver.DontMatchAfaTech (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchCinergy450 (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchCinergyXS (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchEmpia (1.1) [Support]
[not loaded] com.elgato.driver.DontMatchVoyager (1.1) [Support]
[not loaded] com.hzsystems.driver.CDSDAudioCaptureSupport (1.5) [Support]
[not loaded] com.paceap.kext.pacesupport.master (5.6.1) [Support]
[not loaded] com.pgp.iokit.PGPwdeFilter (1.0.1) [Support]
[not loaded] com.roxio.BluRaySupport (1.1.6) [Support]
[loaded] com.squirrels.airparrot.framebuffer (2 - SDK 10.7) [Support]
[loaded] com.squirrels.driver.AirParrotSpeakers (1.7 - SDK 10.7) [Support]
[not loaded] com.wdc.driver.1394HP (1.0.9) [Support]
[not loaded] com.wdc.driver.USBHP (1.0.11) [Support]
/System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
[not loaded] com.paceap.kext.pacesupport.leopard (5.6.1) [Support]
[not loaded] com.paceap.kext.pacesupport.panther (5.6.1) [Support]
[not loaded] com.paceap.kext.pacesupport.tiger (5.6.1) [Support]
Startup Items: ℹ️
PACESupport: Path: /Library/StartupItems/PACESupport
Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
[running] at.obdev.LittleSnitchUIAgent.plist [Support]
[running] com.amazon.sendtokindle.launcher.plist [Support]
Launch Daemons: ℹ️
[running] at.obdev.littlesnitchd.plist [Support]
[loaded] com.barebones.authd.plist [Support]
[running] com.filemaker.fms.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
[not loaded] com.squirrels.kextinstaller.plist [Support]
[failed] PACESupport.plist [Support]
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist [Support]
[loaded] com.adobe.ARM.[...].plist [Support]
[loaded] com.adobe.ARM.[...].plist [Support]
[running] com.genieo.completer.download.plist Adware! [Remove]
[loaded] com.genieo.completer.ltvbit.plist [Support]
[loaded] com.genieo.completer.update.plist Adware! [Remove]
[loaded] com.google.keystone.agent.plist [Support]
[failed] com.Wondershare.TunesGoWatchDemo.plist [Support]
User Login Items: ℹ️
Dropbox Aplicación (/Applications/Dropbox.app)
Genieo Aplicación (/Applications/Genieo.app)
Genieo Aplicación (/Applications/Genieo.app)
Internet Plug-ins: ℹ️
Flip4Mac WMV Plugin: Version: 2.4.2.4 [Support]
QuickTime Plugin: Version: 7.7.3
Default Browser: Version: 600 - SDK 10.10
AmazonMP3DownloaderPlugin: Version: AmazonMP3DownloaderPlugin 1.0.15 [Support]
OfficeLiveBrowserPlugin: Version: 12.2.3 [Support]
Mathematica: Version: 8.0.1.2063850 [Support]
iPhotoPhotocast: Version: 7.0 - SDK 10.7
User internet Plug-ins: ℹ️
WebEx64: Version: 1.0 - SDK 10.6 [Support]
Safari Extensions: ℹ️
Evernote Web Clipper
Slick Savings Adware! [Remove]
Omnibar Adware! [Remove]
MacVeXe
Amazon Shopping Assistant Adware! [Remove]
Ebay Shopping Assistant Adware! [Remove]
Searchme Adware! [Remove]
3rd Party Preference Panes: ℹ️
Flip4Mac WMV [Support]
Perian [Support]
Time Machine: ℹ️
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 748.93 GB Disk used: 665.91 GB
Destinations:
Mi Passport [Local]
Total size: 2.00 TB
Total number of backups: 99
Oldest backup: 2013-01-04 00:59:11 +0000
Last backup: 2014-11-24 02:17:18 +0000
Size of backup disk: Adequate
Backup size 2.00 TB > (Disk used 665.91 GB X 3)
Top Processes by CPU: ℹ️
      38% WindowServer
      33% Finder
      24% calibre
      2% launchd
      2% com.apple.WebKit.Networking
Top Processes by Memory: ℹ️
507 MB calibre
301 MB java
258 MB Finder
232 MB WindowServer
223 MB Safari
Virtual Memory Information: ℹ️
126 MB Free RAM
3.41 GB Active RAM
3.29 GB Inactive RAM
1.44 GB Wired RAM
2.89 GB Page-ins
15 MB Page-outs
Diagnostics Information: ℹ️
Dec 15, 2014, 07:06:53 PM Self test - passed
Dec 15, 2014, 07:02:31 PM CVMCompiler_2014-12-15-190231_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 07:02:11 PM iBooks_2014-12-15-190211_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 07:01:51 PM aslmanager_2014-12-15-190151_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:57:58 PM QuickLookSatellite_2014-12-15-185758_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:57:46 PM QuickLookSatellite_2014-12-15-185746_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:57:23 PM QuickLookSatellite_2014-12-15-185723_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:56:06 PM calibre_2014-12-15-185606_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:55:55 PM mdworker32_2014-12-15-185555_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:55:49 PM garcon_2014-12-15-185549_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:55:35 PM garcon_2014-12-15-185535_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:55:20 PM xpcproxy_2014-12-15-185520_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:53:55 PM mdworker_2014-12-15-185355_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:51:46 PM mdworker_2014-12-15-185146_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:51:30 PM lssave_2014-12-15-185130_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 06:51:30 PM xpcproxy_2014-12-15-185130_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 04:44:18 AM mdworker_2014-12-15-044418_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 01:13:43 AM mdworker_2014-12-15-011343_MacBook-Pro-de-Manuel-3.crash
Dec 15, 2014, 12:07:47 AM mdworker_2014-12-15-000747_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 09:25:36 PM AdobeReader_2014-12-14-212536_MacBook-Pro-de-Manuel-3.hang
Dec 14, 2014, 09:25:34 PM Mail_2014-12-14-212534_MacBook-Pro-de-Manuel-3.hang
Dec 14, 2014, 09:22:33 PM mdworker_2014-12-14-212233_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 09:18:19 PM mdworker_2014-12-14-211819_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 04:52:14 PM mdworker_2014-12-14-165214_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 03:03:01 PM mdworker_2014-12-14-150301_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 03:02:51 PM mdworker_2014-12-14-150251_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 01:14:28 PM mdworker_2014-12-14-131428_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 01:13:34 PM genatsdb_2014-12-14-131334_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 01:12:48 PM lssave_2014-12-14-131248_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 01:12:48 PM mdworker_2014-12-14-131248_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 01:09:13 PM mdworker_2014-12-14-130913_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 10:42:20 AM mdworker_2014-12-14-104220_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 04:04:06 AM mdworker_2014-12-14-040406_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 04:04:06 AM lssave_2014-12-14-040406_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 04:04:06 AM aslmanager_2014-12-14-040406_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 12:44:32 AM maspushagent_2014-12-14-004432_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 12:44:26 AM mdworker_2014-12-14-004426_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 12:44:23 AM lssave_2014-12-14-004423_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 12:44:19 AM aslmanager_2014-12-14-004419_MacBook-Pro-de-Manuel-3.crash
Dec 14, 2014, 12:44:18 AM nehelper_2014-12-14-004418_MacBook-Pro-de-Manuel-3.crash
Dec 13, 2014, 10:55:16 PM mdworker_2014-12-13-225516_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 10:55:15 PM mdworker_2014-12-13-225515_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 06:26:48 PM mdworker_2014-12-13-182648_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 05:13:08 AM AddressBookSourceSync_2014-12-13-051308_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:39:35 AM mdworker_2014-12-13-043935_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:09:31 AM mdworker_2014-12-13-040931_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:08:51 AM mdworker_2014-12-13-040851_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:06:42 AM lssave_2014-12-13-040642_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:06:39 AM lssave_2014-12-13-040639_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:06:30 AM mdworker_2014-12-13-040630_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:06:30 AM lssave_2014-12-13-040630_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:05:33 AM mdworker_2014-12-13-040533_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:03:31 AM iTunes_2014-12-13-040331_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:03:23 AM AddressBookSourceSync_2014-12-13-040323_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:03:12 AM findNames_2014-12-13-040312_MacBook-Pro-de-Manuel-2.crash
Dec 13, 2014, 04:03:02 AM systemstatsd_2014-12-13-040302_MacBook-Pro-de-Manuel-2.crash

First you need to get rid of all the malware on your computer starting with Genieo. Also, get rid of:
[failed] com.Wondershare.TunesGoWatchDemo.plist [Support]
[failed] PACESupport.plist [Support]
Startup Items: ℹ️
PACESupport: Path: /Library/StartupItems/PACESupport
Startup items are obsolete in OS X Yosemite
Helpful Links Regarding Malware Problems
If you are having an immediate problem with ads popping up see The Safe Mac » Adware Removal Guide, AdwareMedic, or Remove unwanted adware that displays pop-up ads and graphics on your Mac - Apple Support.
Open Safari, select Preferences from the Safari menu. Click on Extensions icon in the toolbar. Disable all Extensions. If this stops your problem, then re-enable them one by one until the problem returns. Now remove that extension as it is causing the problem.
The following comes from user stevejobsfan0123. I have made minor changes to adapt to this presentation.
Fix Some Browser Pop-ups That Take Over Safari.
Common pop-ups include a message saying the government has seized your computer and you must pay to have it released (often called "Moneypak"), or a phony message saying that your computer has been infected, and you need to call a tech support number (sometimes claiming to be Apple) to get it resolved. First, understand that these pop-ups are not caused by a virus and your computer has not been affected. This "hijack" is limited to your web browser. Also understand that these messages are scams, so do not pay any money, call the listed number, or provide any personal information. This article will outline the solution to dismiss the pop-up.
Quit Safari
Usually, these pop-ups will not go away by either clicking "OK" or "Cancel." Furthermore, several menus in the menu bar may become disabled and show in gray, including the option to quit Safari. You will likely have to force quit Safari. To do this, press Command + option + esc, select Safari, and press Force Quit.
Relaunch Safari
If you relaunch Safari, the page will reopen. To prevent this from happening, hold down the 'Shift' key while opening Safari. This will prevent windows from the last time Safari was running from reopening.
This will not work in all cases. The shift key must be held at the right time, and in some cases, even if done correctly, the window reappears. In these circumstances, after force quitting Safari, turn off Wi-Fi or disconnect Ethernet, depending on how you connect to the Internet. Then relaunch Safari normally. It will try to reload the malicious webpage, but without a connection, it won't be able to. Navigate away from that page by entering a different URL, i.e. www.apple.com, and trying to load it. Now you can reconnect to the Internet, and the page you entered will appear rather than the malicious one.
An excellent link to read is Tom Reed's Mac Malware Guide.
Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.
See these Apple articles:
Mac OS X Snow Leopard and malware detection
OS X Lion- Protect your Mac from malware
OS X Mountain Lion- Protect your Mac from malware
OS X Mavericks- Protect your Mac from malware
About file quarantine in OS X
If you require anti-virus protection Thomas Reed recommends using ClamXAV. (Thank you to Thomas Reed for this recommendation.)

Computer names keep changing

In the Finder side bar, the name of my computer and the name of one other computer shared in my home network keep incrementing i.e. the same name reappears but with a digit within parenthesis
e.g. MyComputer (6).
The names of the other devices (hard disks) do not change.
Any known reason for that?
Any suggestion on how to avoid, or reset, that ?
Thanks

Hi,
Are you seeing multiple IP addresses and Mac addresses for a device listed in the device list? You can apply the following steps to fix the issue:
Step 1: turn off each device
Step 2: go to the device list and delete the device that is showing the multiple ip address
Step 3: turn on each of the devices one by one and once it's showing in the device with a single ip address, add the device in the DHCP reservation list.

Computer name keeps changing to [myname]'s mac (2)

I change it manually to [myname]'s mac. but few days later the "(2)" keeps appearing. I know its not a "problem", but I don't understand why that happens.

Mine does the same thing. I have also seen others mention the issue as well.
I think that it has to do with your iMac and your router not interfacing correctly. It seems to occur when the Mac wakes up and asks the router for an IP through DHCP and the router has not forgotten the Mac's last IP. The router tells the Mac that another device is using that name and so the Mac alters its name to obtain an IP.
Dah•veed

Unable to bootup after Yosemite install. have to keep shutting down from rear button. it does come on after a few times but then hangs at user login again. If you get in it is great. Seems faster than Mavericks but there is some sort of issue, bouts

unable to bootup after Yosemite install. have to keep shutting down from rear button. it does come on after a few times but then hangs at user login again. If you get in it is great. Seems faster than Mavericks but there is some sort of issue, bootup /login.

Knock on wood, this seems to have been my problem as well. I stumbled on this thread after dealing with this ridiculously-long boot times for the past several weeks.
I just reinstalled McAfee Antivirus and my Macbook Air booted up in less than 1 minute. No more hanging on the boot-up progress bar. No more hanging after I click on my user's avatar on the log-in screen. Bootup would often take 5+ minutes and sometimes never complete.
This has been SUPREMELY frustrating.
THANK YOU SO MUCH FOR POSTING YOUR RESPONSE!!!

Computer name keeps changing after Yosemite install

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