27"iMac (mid 2011) wifi won't wake up from sleep

I have been using my brand new core i7 27" iMac for the last week! And I have noticed a wifi bug that's driving me crazy!
Everytime my iMac goes to sleep when I wake it up the wifi won't detect any networks at all. It's just like if the wireless card is still sleeping! At first I waited for a while because I thought it would take longer to wake up! But it never detected any networks at all.
If I manually turn the wifi Off and then turn it back ON then it detects my network and all the wireless networks around with any problem.
My home router is an Airport Extreme Dual Band !
Is anyone out there having the same issue? or could it be that I got a faulty airport extreme card in my iMac??

Hi Npalamidis,
finally I solved the problem by changing the channel in my router manually - that's all!
I would never have considered so because my iMac late 2007 which was replaced by the new iMac worked at the same place and with the same router without any problems.
By chance I found a general hint to do so in a forum...
However - the story remains strange and if you do not have at least a minimum of computer knowledge you are totally lost!
Hope, you get your problem solved as well!
Greets, Christian

Similar Messages

IMac Mid 2010 kernel panic after wake up from sleep mode

Hello.
One month ago starting my iMac Mid 2010 occasionally goes to kernel panic. When I click on mouse or press any key, system starting up, but very very slowly, (time on logon screen stay same without refresh) and after few minutes (from 1 - 10 minutes) kernel panic message is appear on screen. I have Mac OS 10.7.5 version installed.
Is there any tool to debug what is wrong. Windows OS has WinDebuger to detaily look inside to core dump and analyze it and in my experience almost allways is possible to detect root of problem.
First of all i was try HW diagnostic from DVD, succesfully passed. Then I run Permission Repair procedure, there were many folders and files with different ACL as system expected.
It is possible that graphic card driver is wrong or has bug from my point of laic view.
I have minimum application with kext installed into system:
VMware fusion
NTFS-3g ( long time same version )
There is part of long kernel panic message:
Interval Since Last Panic Report: 12304 sec
Panics Since Last Report:          2
Anonymous UUID:                    5D8F11DC-6A58-44A2-9C21-E43CFB9935BC
Tue Dec 4 22:05:16 2012
panic(cpu 2 caller 0xffffff80002c4794): Kernel trap at 0xffffff7f8161786d, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x00007fff90fdb488, CR3: 0x000000007bb6201a, CR4: 0x00000000000206e0
RAX: 0xffffff801915a8c8, RBX: 0xffffff800c938300, RCX: 0xffffff801915a8a8, RDX: 0x0000000090fdb000
RSP: 0xffffff807ea237f0, RBP: 0xffffff807ea23810, RSI: 0x000000008e2cf520, RDI: 0xffffff800bac80c0
R8: 0x0000000000994000, R9: 0x000000000fff0000, R10: 0x0000000000000002, R11: 0x0000000000000001
R12: 0x00000000000000b6, R13: 0xffffff800c938300, R14: 0x00007fff90fdb480, R15: 0xffffff800bac80c0
RFL: 0x0000000000010286, RIP: 0xffffff7f8161786d, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0x00007fff90fdb488, Error code: 0x0000000000000003, Faulting CPU: 0x2
Backtrace (CPU 2), Frame : Return Address
0xffffff807ea234a0 : 0xffffff8000220792
0xffffff807ea23520 : 0xffffff80002c4794
0xffffff807ea236d0 : 0xffffff80002da55d
0xffffff807ea236f0 : 0xffffff7f8161786d
0xffffff807ea23810 : 0xffffff7f81664262
0xffffff807ea23830 : 0xffffff7f81664984
0xffffff807ea23870 : 0xffffff7f81621b7d
0xffffff807ea23890 : 0xffffff7f815f93bb
0xffffff807ea238c0 : 0xffffff7f815fcf47
0xffffff807ea23910 : 0xffffff7f81630096
0xffffff807ea23960 : 0xffffff7f81647786
0xffffff807ea239b0 : 0xffffff7f816414bc
0xffffff807ea23a00 : 0xffffff7f81601477
0xffffff807ea23a40 : 0xffffff7f8163efdd
0xffffff807ea23a90 : 0xffffff7f81604a46
0xffffff807ea23b60 : 0xffffff7f81601afc
0xffffff807ea23bc0 : 0xffffff8000655f3e
0xffffff807ea23be0 : 0xffffff800065681a
0xffffff807ea23c40 : 0xffffff8000656fbb
0xffffff807ea23d80 : 0xffffff80002a3f08
0xffffff807ea23e80 : 0xffffff8000223096
0xffffff807ea23eb0 : 0xffffff80002148a9
0xffffff807ea23f10 : 0xffffff800021bbd8
0xffffff807ea23f70 : 0xffffff80002aef10
0xffffff807ea23fb0 : 0xffffff80002daec3
      Kernel Extensions in backtrace:
         com.apple.ATIRadeonX2000(7.3.2)[9B704AFE-AF23-381E-A057-5982532504F5]@0xffffff7 f815f8000->0xffffff7f818cafff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8082b000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f80cb3000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f80c7a000
BSD process name corresponding to current thread: loginwindow
Mac OS version:
11G63b
Many thanks for any helping suggestion.
Mano

Here you are rest of KP message:
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
System model name: iMac11,2 (Mac-F2238AC8)
System uptime in nanoseconds: 40019343425940
last loaded kext at 37729361423656: com.apple.filesystems.msdosfs    1.7.1 (addr 0xffffff7f80798000, size 57344)
last unloaded kext at 37908230931100: com.apple.driver.AppleUSBCDC    4.1.22 (addr 0xffffff7f80795000, size 12288)
loaded kexts:
com.github.osxfuse.filesystems.osxfusefs    2.5.2
com.vmware.kext.vmnet    3.1.4
com.vmware.kext.vmioplug    3.1.4
com.vmware.kext.vmci    3.1.4
com.vmware.kext.vmx86    3.1.4
com.apple.driver.AppleBluetoothMultitouch    70.12
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.driver.AudioAUUC    1.59
com.apple.driver.AGPM    100.12.75
com.apple.filesystems.autofs    3.0
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleUpstreamUserClient    3.5.9
com.apple.driver.AppleHDA    2.2.5a5
com.apple.driver.AppleMikeyDriver    2.2.5a5
com.apple.kext.ATIFramebuffer    7.3.2
com.apple.ATIRadeonX2000    7.3.2
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.iokit.IOBluetoothSerialManager    4.0.8f17
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.2.3
com.apple.driver.ApplePolicyControl    3.1.33
com.apple.driver.ACPI_SMC_PlatformPlugin    5.0.0d8
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.AppleBacklight    170.2.2
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.driver.BroadcomUSBBluetoothHCIController    4.0.8f17
com.apple.driver.AppleUSBCardReader    3.0.6
com.apple.driver.AppleIRController    312
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    33
com.apple.iokit.SCSITaskUserClient    3.2.1
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCISerialATAPI    2.0.3
com.apple.iokit.IOAHCIBlockStorage    2.1.0
com.apple.driver.AppleUSBHub    5.1.0
com.apple.driver.AppleFWOHCI    4.9.0
com.apple.iokit.AppleBCM5701Ethernet    3.2.4b8
com.apple.driver.AirPort.Atheros40    505.67.1
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleUSBEHCI    5.1.0
com.apple.driver.AppleACPIButtons    1.5
com.apple.driver.AppleAHCIPort    2.3.1
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.5
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    195.0.0
com.apple.nke.applicationfirewall    3.2.30
com.apple.security.quarantine    1.4
com.apple.security.TMSafetyNet    8
com.apple.driver.AppleIntelCPUPowerManagement    195.0.0
com.apple.driver.AppleMultitouchDriver    231.4
com.apple.driver.IOBluetoothHIDDriver    4.0.8f17
com.apple.kext.triggers    1.0
com.apple.driver.DspFuncLib    2.2.5a5
com.apple.kext.ATI4600Controller    7.3.2
com.apple.kext.ATISupport    7.3.2
com.apple.iokit.IOFireWireIP    2.2.5
com.apple.iokit.IOSurface    80.0.2
com.apple.iokit.IOSerialFamily    10.0.5
com.apple.driver.AppleHDAController    2.2.5a5
com.apple.iokit.IOHDAFamily    2.2.5a5
com.apple.iokit.IOAudioFamily    1.8.6fc18
com.apple.kext.OSvKernDSPLib    1.3
com.apple.driver.AppleSMC    3.1.3d10
com.apple.driver.IOPlatformPluginLegacy    5.0.0d8
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleGraphicsControl    3.1.33
com.apple.driver.IOPlatformPluginFamily    5.1.1d6
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.iokit.IONDRVSupport    2.3.4
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.IOGraphicsFamily    2.3.4
com.apple.driver.AppleUSBHIDKeyboard    160.7
com.apple.driver.AppleHIDKeyboard    160.7
com.apple.driver.AppleUSBBluetoothHCIController    4.0.8f17
com.apple.iokit.IOBluetoothFamily    4.0.8f17
com.apple.iokit.IOSCSIBlockCommandsDevice    3.2.1
com.apple.iokit.IOUSBMassStorageClass    3.0.3
com.apple.iokit.IOUSBHIDDriver    5.0.0
com.apple.driver.AppleUSBMergeNub    5.1.0
com.apple.driver.AppleUSBComposite    5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.2.1
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOSCSIArchitectureModelFamily    3.2.1
com.apple.iokit.IOFireWireFamily    4.4.8
com.apple.iokit.IOUSBUserClient    5.0.0
com.apple.iokit.IOEthernetAVBController    1.0.1b1
com.apple.iokit.IO80211Family    420.3
com.apple.iokit.IONetworkingFamily    2.1
com.apple.iokit.IOUSBFamily    5.1.0
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOHIDFamily    1.7.1
com.apple.iokit.IOAHCIFamily    2.0.8
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    177.8
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.DiskImages    331.7
com.apple.iokit.IOStorageFamily    1.7.2
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.5
com.apple.iokit.IOPCIFamily    2.7
com.apple.iokit.IOACPIFamily    1.4
Model: iMac11,2, BootROM IM112.0057.B01, 2 processors, Intel Core i3, 3.06 GHz, 4 GB, SMC 1.64f5
Graphics: ATI Radeon HD 4670, ATI Radeon HD 4670, PCIe, 256 MB
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: WDC WD5000AAKS-40V6A0, 500.11 GB
Serial ATA Device: OPTIARC DVD RW AD-5680H
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfa140000 / 5
USB Device: Apple Keyboard, apple_vendor_id, 0x0221, 0xfa142000 / 7
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 6
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 3
Mano

Won't wake up from sleep mode

I have only had my iMac for a couple weeks and four times now it won't wake up from sleep mode. I have to use the on/off button for a response.

Since you have a new machine, I would call Apple immediately and have them deal with the problem.

X1C won't wake up from sleep mode using keyboard

Hi...so finally got my X1C today. One thing I am noticing is that the machine won't wake up from sleep mode when I press any key on the keyboard -- it only wake up by pressing the power key. This is a bit unexpected to me. Is it by design, and is there any way to change this?
Thanks for your help.
Solved!
Go to Solution.

Does it awaken from stand-by if you press the Fn key? That's been the ThinkPad standard for as long as I can remember.
Regards.
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MacBook screen goes gray and won't wake up from sleep - 10.6.2

We have a MacBook Alum running 10.6.2 with 4gb ram.
We recently upgraded to 10.6.2 from Leopard and this issue started to happen.
It seems that as the MacBook goes to sleep or goes to the screensaver mode, the screen goes gray and won't wake up from sleep or screensaver mode without a hard reboot.
Is Apple aware of this issue? It did not happen with the previous version of Leopard. This issue arrived when we upgraded to Snow Leopard. Other than the sleep issue, SL is rock solid. Kudos to Apple for producing a great OS!

Hi GrooveDaddy,
Have you contacted AppleCare via telephone to make them aware of this issue? It definitely doesn't sound like normal behavior. What sort of troubleshooting have you done so far on the issue? What sort of settings do you have on your screen saver? Password protected? Custom iPhoto slideshow?
What if you manually sleep the machine by closing the lid or engaging it via software (via the Apple menu) does the screen have the issue in both scenarios?

G3 Bronze Keyboard won't wake up from sleep

I have a hand-me-down Powerbook G3 Lombard 400 Mhz (bronze keyboard), with a dead main battery. It works great with the power adapter, and has just enough charge for me to move it from one outlet to another without shutting down. I'm trying to set it up for use as an Itunes server connected to my home stereo, which is fine because it will always be plugged in.
The problem is that the laptop won't wake up from sleep. This morning I noticed that the display and HD seemed to be sleeping, but the fan/processor buzzing noise was still going (there were no lights other than the little green light on my PCI card). I couldn't figure out any combination of keyboard or power key strokes that would either wake it up or shut it down. I unplugged it, waited half an hour or so, and it finally shut down. I then plugged in, hit power, and it started and booted perfectly (after the expected disk check for abnormal shutdown). Then this afternoon, the whole thing was sleeping (I think -- no sound, no lights other than PCI card light), and again it wouldn't wake up. Again, I unplugged, let it power down (waited for the PCI light do die), the replugged and it started up just fine.
Any idea what gives? Or what I do when it's sleeping? Right now, I have changed the power saving settings so that it never goes to sleep, but I'd really like to let it sleep when people forgot to turn it off...
thanks!

aldpol,
There are many causes for sleep issues and you just have to wade through them one at a time.
You can always force a Lombard or newer powerbook to shut down by pressing/holding the power button until it turns off. As you have noted, this is an undesirable process since you can corrupt the HD.
I would start the troubleshooting in this manner:
1. Unplug all peripherals (PC cards, mouse, everything).
2. Reset the power manager:
http://support.apple.com/kb/HT1431?viewlocale=en_US
3. Now put the powerbook to sleep via the Special menu, wait a minute or so, then wake.
4. If no success, restart while pressing the shift key until you see the message 'extensions off', then release. Now test sleep/wake.
If number #3 is successful, one of you peripherals is probably the troublemaker. If still having issues, please post back with more details if possible.

Powerbook G4 won't wake up from sleep

My 4 1/2 year old powerbook G4 won't wake up from sleep anymore. After I close the lid, or even manually put it to sleep, I can still hear the HD run. The backlight on the top of the lid never lights up and when I open the lid the blank screen doesn't do anything. The only way for me to work around this issue is to power down the laptop and start it up again. Since I've been having this issue every program that I use take forever to load. The spinning color wheel is the bane of my existence! I tried resetting the PRAM, I used Onyx to repair file permissions, and am out of ideas. Any help would be greatly appreciated.

How incredibly strange. I am having exactly the same problems with my computer. I just started the same behavior today. I have tried using MacJanitor, repaired permissions, verified disk, but it still will not go to sleep properly. S.M.A.R.T status is verified
I have tested my RAM as described above with no problems surfacing. Anyone else have any ideas that we can try. When I get home on Sunday I will try some more intense investigative tools including re-installing OSX 10.5
By the way, I am running 10.5.4 on a 15" 1.5Ghz G4 Powerbook with 1.25GB of RAM and 28.9GB harddrive free.
Another strange thing I have also observed is that it now takes 10 minutes to start up. 5 minutes on the Apple screen with pinwheel, and then 5 minutes with the blue screen before the cursor appears. After that point startup is normal. Also, even though Disk Utility shows 28 GB free on my harddrive when I try to copy something, it says that I do not have enough free space on my harddrive.
Do you suppose this means that my harddrive is on the way out? Is this also the case of the original poster?

My mac won't wake up from sleep, what can i do

My mac won't wake up from sleep, what can i do

Can you say more about thermal cut-off? My mac has beene having problems waking from sleep and I have noticed that I hear the fan running ever so slightly in the background. When I depress the power button for a second the fan shuts off.
Just open the side an dlook to see which fan it is. The lower fands are easy to see as well as the video card fan.
When you push the power button and that fan goes off is the machine now fully off? No power light? No fans spinning? Now drives spinning?
I don't recall what I did when my machine shut off with the one exhaust fan running. I think the obvious thing I would have tried would have been to push power button for 10 seconds to shut it down fully. That or actually pull the plug.
When this happens the only way to use my Mac is to restart via the power button.
Then I guess that answers the first question. It must have turned off since pushing the power button again was the normal reboot.
I can't find any helpful info on thermal cut-off so I was wondering if you could explain what it is, what causes it, and more importantly what I can do to fix it?
That was my term for it. What else could it be? Without its fan video card would get extremely hot and throw off all that heat. Whats the point of having temperature sensors in so many places other than to use that info to protect the machine against damage due to overheating? So my assumption was card gets hot, sensor (probably the pci slot 1 temperature sensor) senses it, kills the machine. It's also seems logical to me that the circuit(s) handling temperature overloads would want to keep a exhaust fan running to dump the heat out of the machine to further protect any damage from the heat.

It won't wake up from sleep after I open it. If I close it and then open it, it doesn't wake up for at least 5 minutes.

just upgrade my macbook air to yosemite. now when i physically close the computer and open it back up, it won't wake up from sleep mode. I tried pressing the power button, but it wouldnt turn on. Then once it somehow turned on by itself, I tried a PRAM and SMC reset. Then I tried closing and opening the computer again and I still had the same problem. nothing has worked. when i do get the computer on, i randomly goes into sleep mode again. I've check the settings for display and it says after 45 minutes of nothing it will sleep.

Step 1
Take all the applicable steps in this support article. That's the starting point for any further efforts to solve the problem. Please read the whole article carefully (some of it is hidden by disclosure triangles) and don't skip any of the steps, including the ones under the heading "Additional troubleshooting." If you don't understand any of the steps, ask for guidance.
Step 2
If you're running OS X 10.8.5 or earlier, from the menu bar select
           ▹ System Preferences... ▹ Accessibility
If the checkbox at the bottom marked
          Enable access for assistive devices
is checked, uncheck it and test.
If you're running OS X 10.9 or later, select
           ▹ System Preferences... ▹ Security & Privacy ▹ Privacy ▹ Accessibility
If any applications are listed on the right and have a checked box next to them, uncheck all the boxes and test. You may first have to click the padlock icon in the lower left corner of the window and authenticate as an administrator to unlock the settings.
Step 3
In the Energy Saver pane of System Preferences, uncheck the box marked
          Put hard disks to sleep when possible
Step 4
This and the next step must be taken as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that heading, select
          View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You may see one or more reports with a name that begins with "Sleep Wake Failure" followed by a date. Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
I know the report is long, maybe several hundred lines. Please post all of it anyway.
Step 5
In the Console window, select
          DIAGNOSTIC AND USAGE INFORMATION ▹ Diagnostic and Usage Messages
In the search box in the window's toolbar, enter "powerd" (without the quotes.)
You may see one or more lines like this:
com.apple.message.signature: Platform Failure
If you do see that, and you did everything in the preceeding steps, then you're dealing with an internal hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Does anyone know what to do when a apple mac book pro screen won't wake up from sleep?

Does anyone know what to do when a apple mac book pro screen won't wake up from sleep? I have tried to restart it and it still won't come on.

Try this, which is located in your macbook pros user manual.

My early 2008 MacBook won't wake up from sleep

My early 2008 MacBook won't wake up from sleep periodically. I will have to hold the power button down and then restart when it acks up. It did this twice yesterday & once today.

Try resetting the PMU (power management unit).
Remove battery and power adapter.
Hold down power button for 10 seconds.
Reinstall battery and attach power adapter.
Hold down Command-Option-P-R, a total of four keys, and press power button. Don't release the keys.
Continue holding the four keys until you hear the startup sound twice, then release.

MacBook won't "wake" up from sleep, when being folded

When I "fold" computer it goes to sleep. But, when I flip up the screen again, my Mac won't "wake" up from sleep mode anymore.
Do anyone know how to fix this problem?
BR
Christian
I have a MacBook 2.26 GHz Intel Core 2 duo, Snow Leopard 10.6.8.

I've solved my problem.
I have reset my MacBook's PRAM settings.
It's very easy: link: http://support.apple.com/kb/HT1379
Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Hope this helps
Best regards,
Christian

G5 won't wake up from sleep & fans go to high speed ???

G5 won't wake up from sleep & fans will go to high speed within a few minutes of it going to sleep. Whether I put it to sleep or it goes to sleep on it's own per my preferences in energy saver. I have to manually shut it down by holding the power button in. I ran the system hardware dvd and results were good. I have repaired permissions, reset the PRAM.
Any ideas?

Hi Patrick,
How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
"Try Disk Utility
1. Insert the Mac OS X Tiger Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, test sleep in Safe Mode, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

After update to 10.7.1, Wifi retrieved after wake up from sleep?

Anyone who had "no wifi after wake up from sleep @ MBA 2011 " issue before, is this fixed after 10.7.1 update installed? Any tester please drop your comment.

In another Mac forum saying that after the 10.7.1 update, need to reset the PRAM to get this issue solved.

IPhone 5 won't wake up from sleep/standby!!

Hello, I am having a really strange problem with my iphone 5 for last 3-4 months. Sometime when i want to use my iphone from standby/sleep mode it dosent do anything! sleep/wake button, home button even silent/sound button dosent work. I know the silent/sound button dosen't work cause normally it vibrate when I turn it on. So the problem is my phone wont wake up from sleep/standby mode. The screen stays black and nothing works. If i press the home button and power button for 10-15 time very quickly, then it takes a screen shot and wakes up!! Sometime it stays in this stage for 5-10min.
So here is what i did to solve the problem.
1. I restore the phone from phone and ituens.
2. I delete all icloud backup and started as a new phone
3. I went to apple store and replace the phone with a new one!!
4. I jailbreak it at last to see if it solve the problem!
5. turn off the icloud to see if it works
And sadly nothing of all this solved my problem! Now im not sure any specific app causing the problem but it almost impossible to find it out. So if anyone have any similar problem or any suggestion to solve it, then it will be really helpful.

Hi All,
I hope I don't jinx it by posting this. Yesterday I changed two of my settings and the issue has not occured again.
I changed the carriers settings and the LTE settings.
I went into "Settings" - then went into "Carrier" - Then I switched the "Automatic" to "OFF" I waited for the the carrier to show up (in my case Vodafone), then selected "vodafone au" manually.
Then I went into "Settings" - Then went into "General" - then I switched OFF the "Enable LTE" option (In my case I have switched this option OFF as I have not been sent the message to advise that I now have 4G service. According to Vodafone support, Not all vodafone customers have 4G only a selected 40 thousand customers accross Australia, I think all customers will have 4G around mid July )
Once this is done, I switched the phone off, Waited around a minute and then switched the phone back on.
I will update in a week if the problem doesn't happen.

27"iMac (mid 2011) wifi won't wake up from sleep

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