IMac shutting down, problems connecting to internet

I have a 3-year old IMac that I am having problems with. The problems started gradually with trouble putting the computer to sleep, getting the grey film over the computer screen, telling me I need to shut down, and now when it's asleep, it will automatically shut down. When it is asleep, I have trouble waking it back up. I have to press the power button and re-start. Also, I have trouble connecting to the internet. It says "problems connecting to the internet". I have unplugged all cables, power cords, etc. and re-plugged everthing, and I still cannot connect. Any ideas?

To Apple Discussions!
A few suggestions:
Repair permissions & restart your comp.
Go to Applications>Utilities>Disk Utility and select your volume and then select Repair Permissions.
http://docs.info.apple.com/article.html?artnum=303698 Mac OS X: Why your Mac might not sleep or stay in sleep mode
See Knowledge Base Article http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).
http://docs.info.apple.com/article.html?artnum=106805 Mac OS X: "Broken folder" icon, prohibitory sign, or _*kernel panic*_ when computer starts
User Tips: Kernel Panics
Check to determine if your computer qualifies for the G5 iMac Repair Programs
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**
"I have trouble connecting to the internet. It says "problems connecting to the internet"."
What type of internet service do you have? Cable, DSL, Dial-up or Satallite?

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IMac shuts down after connecting powered USB connector

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check KERNEL.LOG and CrashReporter under Files in Console.

TS1388 iMac shuts down while on line

iMac shuts down (crashes) while using internet only - this started after installing Mavericks X ... I have reinstalled operating system twice and it still happens

Here you go, Linc
Sun Nov 9 07:13:13 2014
*** Panic Report ***
panic(cpu 2 caller 0xffffff802c01e80a): Kernel trap at 0xffffff802c0059ad, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x00000001025a3000, CR3: 0x000000053130b056, CR4: 0x00000000000626e0
RAX: 0xffffff804ce9d280, RBX: 0x00000000073ba280, RCX: 0xffffff804ce9d298, RDX: 0xffffff8050d9efc0
RSP: 0xffffff8279d1bc60, RBP: 0xffffff8279d1bd40, RSI: 0x000000000edc0000, RDI: 0x0000000000000029
R8: 0x0000000000000069, R9: 0x0000000000000000, R10: 0x000000000edc0000, R11: 0x000000000edd8000
R12: 0xffffff804ce9d290, R13: 0xffefff804ce9d280, R14: 0xffffff8045ae3000, R15: 0xffffff806ae08750
RFL: 0x0000000000010206, RIP: 0xffffff802c0059ad, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x00000001025a3000, Error code: 0x0000000000000000, Fault CPU: 0x2
Backtrace (CPU 2), Frame : Return Address
0xffffff8279cd5e10 : 0xffffff802bf3a811
0xffffff8279cd5e90 : 0xffffff802c01e80a
0xffffff8279cd6050 : 0xffffff802c03a443
0xffffff8279cd6070 : 0xffffff802c0059ad
0xffffff8279d1bd40 : 0xffffff802c0065e5
0xffffff8279d1bda0 : 0xffffff802bfb6b4a
0xffffff8279d1beb0 : 0xffffff802bfacd2c
0xffffff8279d1bee0 : 0xffffff802bf32df7
0xffffff8279d1bf10 : 0xffffff802c009f6b
0xffffff8279d1bfb0 : 0xffffff802c03aa18
BSD process name corresponding to current thread: Google Chrome He
Mac OS version:
14A386b
Kernel version:
Darwin Kernel Version 14.0.0: Sat Sep 27 03:58:47 PDT 2014; root:xnu-2782.1.97~11/RELEASE_X86_64
Kernel UUID: D1F807E1-A660-3126-96DF-6A9E65444DA3
Kernel slide: 0x000000002bc00000
Kernel text base: 0xffffff802be00000
__HIB text base: 0xffffff802bd00000
System model name: iMac12,1 (Mac-942B5BF58194151B)
System uptime in nanoseconds: 3952498468911
last loaded kext at 339952139872: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7faeb4a000, size 69632)
last unloaded kext at 409372023064: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7faeb4a000, size 61440)
loaded kexts:
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AGPM 100.14.32
com.apple.driver.AppleBluetoothMultitouch 85.3
com.apple.iokit.IOBluetoothSerialManager 4.3.0f10
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleHDA 266.5
com.apple.kext.AMDFramebuffer 1.2.8
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleMikeyDriver 266.5
com.apple.driver.AppleBacklight 170.4.12
com.apple.driver.AppleThunderboltIP 2.0.2
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.AMDRadeonX3000 1.2.8
com.apple.kext.AMD6000Controller 1.2.8
com.apple.driver.AppleLPC 1.7.3
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.driver.AppleMCCSControl 1.2.10
com.apple.driver.AppleIntelHD3000Graphics 10.0.0
com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0
com.apple.iokit.SCSITaskUserClient 3.7.0
com.apple.driver.AppleUSBCardReader 3.5.0
com.apple.driver.AppleIRController 327.5
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.5
com.apple.driver.AppleUSBHub 705.4.1
com.apple.iokit.AppleBCM5701Ethernet 10.1.2b3
com.apple.driver.AirPort.Atheros40 700.74.5
com.apple.driver.AppleFWOHCI 5.5.2
com.apple.driver.AppleAHCIPort 3.0.7
com.apple.driver.AppleUSBEHCI 705.4.14
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleACPIButtons 3.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 3.1
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0
com.apple.nke.applicationfirewall 161
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleIntelCPUPowerManagement 218.0.0
com.apple.driver.AppleBluetoothHIDKeyboard 175.5
com.apple.driver.AppleHIDKeyboard 175.5
com.apple.driver.IOBluetoothHIDDriver 4.3.0f10
com.apple.driver.AppleMultitouchDriver 260.30
com.apple.iokit.IOSerialFamily 11
com.apple.kext.triggers 1.0
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.IOPlatformPluginLegacy 1.0.0
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.driver.AppleThunderboltEDMSink 4.0.2
com.apple.iokit.IOUSBUserClient 705.4.0
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.iokit.IOBluetoothFamily 4.3.0f10
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleSMC 3.1.9
com.apple.iokit.IOAcceleratorFamily2 156.4
com.apple.kext.AMDSupport 1.2.8
com.apple.AppleGraphicsDeviceControl 3.7.19
com.apple.driver.IOPlatformPluginFamily 5.8.0d49
com.apple.driver.AppleHDAController 266.5
com.apple.iokit.IOHDAFamily 266.5
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.driver.AppleSMBusController 1.0.13d1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.0
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOAHCISerialATAPI 2.6.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.0
com.apple.iokit.IOUSBMassStorageClass 3.7.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.0
com.apple.iokit.IOUSBHIDDriver 705.4.0
com.apple.driver.AppleUSBMergeNub 705.4.0
com.apple.driver.AppleUSBComposite 705.4.9
com.apple.driver.AppleThunderboltDPInAdapter 4.0.6
com.apple.driver.AppleThunderboltDPOutAdapter 4.0.6
com.apple.driver.AppleThunderboltDPAdapterFamily 4.0.6
com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2
com.apple.driver.AppleThunderboltNHI 3.1.7
com.apple.iokit.IOThunderboltFamily 4.2.1
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IO80211Family 700.52
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOFireWireFamily 4.5.6
com.apple.iokit.IOAHCIFamily 2.7.0
com.apple.iokit.IOUSBFamily 705.4.14
com.apple.driver.AppleEFINVRAM 2.0
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
com.apple.driver.AppleKeyStore 2
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.corecrypto 1.0
com.apple.kec.Libm 1
com.apple.kec.pthread 1
System Profile:
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380: 4.0.74.0-P2P
Bluetooth: Version 4.3.0f10 14890, 3 services, 27 devices, 1 incoming serial ports
Thunderbolt Bus: iMac, Apple Inc., 25.1
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E4D3136464444
Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1333 MHz, 0x859B, 0x435438473353313333394D2E4D3136464444
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Neat ADF Scanner
USB Device: BRCM2046 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: GoFlex Desk
USB Device: IR Receiver
USB Device: Internal Memory Card Reader
Serial ATA Device: ST3500418AS, 500.11 GB
Serial ATA Device: OPTIARC DVD RW AD-5690H
Model: iMac12,1, BootROM IM121.0047.B1E, 4 processors, Intel Core i5, 2.5 GHz, 20 GB, SMC 1.71f22
Network Service: Wi-Fi, AirPort, en1
Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe, 512 MB

Problem = always shut down when connect to the internet (both via wifi & mobile data)

problem = always shut down when connect to the internet (both via wifi & mobile data) my problem is my phone (sony z1) regularly shut down automatically when connect to the internet (both via wifi & mobile data). it just happens after i downloaded and installed the latest available software (as following): Android version: Google Android 4.3 (Jelly Bean) Latest available software: 14.2.A.1.136 Release started: 2014-01-30 please suggest how to fix this problem.

I suggest you disable any battery savers or task killers if you have.Boot your phone in safe mode and see how it is:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien

IMac shutting down on startup - Can't enter safe mode as wireless keyboard doesn't connect quickly enough

Hi all,
I was planning to use bootcamp to install Windows 7 on my mid-2010 21.5" iMac.
Bootcamp recommended I usk disk utility to repair the drive. I had a snow leopard install disk in the drive, (I didn't realise Lion already had it's recovery tools built in to the hard drive.)
Disk utility said it can't repair the drive and recommended I start backing up my data (because the hard drive could be about to fail). Fine, so I restarted, with the intention of backing up everything (all my work for the last 12 months). So I press the power button, grey screen comes up, then the apple logo, then a progress bar appears (found this odd at first, but later found out it has something to do with disk utility and a bad hard drive) it gets to around 20% and then all power is cut from the iMac and the hard drive stops/everything powers down.
Now, I can't seem to get my iMac to boot into recovery utilities or into safe mode because it doesn't connect to the wireless keyboard in time before it shuts down. So, if I use a wired keyboard (I have a dell USB keyboard that I can take from the office), will I be able to boot into safe mode?
Also, if the disk in drive is causing the problem, then I can't remove it because the wireless keyboard won't connect/register any keypresses.

Ok so, status report:
Wired keyboard is non responsive when I plug it in before/during boot. So i guess it needs to be plugged in before the iMac shut down. That's that out the window.
Plugged in headphones and I can't hear the startup chime so don't know when to start holding buttons.
To make matters worse, the wireless keyboard is no longer paired with the iMac, getting a green blinking light which indicates it wants to connect to a computer or device.
So I can't enter any commands whatsoever, can't remove the disk in the drive or boot safe mode. It's my worst nightmare.

Hi i am having problems connecting to internet using ethernet,in the network diagnostics i get all green,except network settings which is orange.i am running mountain lion on intel imac

hi i am having problems connecting to internet using ethernet,in the network diagnostics i get all green,except network settings which is orange.i am running mountain lion on intel imac

hi have done as you said plug ethernet straight into computer and into back of router,and worked straight off,i had the the powerline on extention when imac was up stairs,when i had computer down stairs it still would not work with powerlines even on main wall sockets,so they are getting binned,looks like i will have to move router upstairs,just wondering if i got extention wire from back of openreach box to router upstairs```,would it be ok,,the openreach box is next to my only phone socket in house,which is in back kitchen..any advice would be great,

IMac shuts down when using Safari 2.0.4

My iMac shuts down when I visit certain websites such as Pogo or video sites. Took it to the Apple store and of course the problem wouldn't replicate there. They kept it to check out the scripts and logs to see if they could find a problem - without success; although they did suggest my house is haunted. Brought it home and it quit again.
We thought perhaps we were getting interference from other wireless devices and unplugged our cordless phone which worked for a day. The computer always turns back on so its more of an annoyance than a real problem, but I'm baffled.
It also happened once when I was downloading from the iTunes store, but is most prevalent with Safari.
We have wireless internet connected via ethernet to an Airport Express.
Any ideas? Thanks.
iMac G5 Mac OS X (10.4.10)

Hi Barry -
Yes I do live near a ghost town (kinda) - Virginia City, NV. And I did tell any unwanted visitors to leave.
Actually, in the last year, they have replaced the Super drive, power supply, inverter and logic board. The only reason I'm not thinking power issues is that it only happens when I'm in Safari or iTunes. I would use Firefox except I've got java issues with that. I can (and do) use the machine for other things all day long without problems. I can use Safari all day long as long as I'm not playing on Pogo or certain video sites. Maybe Pogo is haunted?
It also doesn't happen on my husband's iMac on the other side of the house. Is there something that could cause enough interference to actually make the machine shut down? Oh, the antennae for the satellite TV and internet are on the roof directly above me, if that would have anything to do with it.
Thanks for your help.

Issue setting up eFax on HP Photosmart 7510 e-All-in-One "Problem connecting to internet"

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Let's set a static IP address and external DNS for the printer:
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- Use 255.255.255.0 for the subnet (unless you know it is different, if so, use that)
- Enter your router's IP (on the Network Config Page) for the gateway.
- Enter 8.8.8.8 for the first DNS and 8.8.4.4 for the second DNS.
- Click 'Apply'.
Now, shut down the router and printer, start the router, wait, then start the printer.
After this you may need to redo 'Add a Printer' using the new IP address.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

IMac shuts down after removing Mini DisplayPort to SVGA

Hi,
The last couple of years I have worked with a 27 inch iMac in combination with a HP 27 inch monitor. This monitor is connected via a Mini Displayport to SVGA connector. Because I am going to use this external monitor anymore, I disconnected it today which made my iMac shut down imediately. Then it keeps rebooting and trying to start up but shuts down again. Over and over.
The problem stops as soon as I connect the monitor again.
Anybody have any thoughts?

Hello there, TheCapGuy.
The following Knowledge Base article is a great resource for steps in troubleshooting spontaneous restarts:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

Imac shuts down when loading new music or new software

My Imac shuts down (intermittently) when loading music or software. Logic board was replaced I believe because fire wire connection was intermittently not working (1st year).
Hard drive was replaced recently (Dec 2010). Now SuperDrive and Cable (Optical Data, Flexible) was JUST replaced. But when I was on my third CD loading it shut down 3 times.
Has anyone had this problem and know of a solution?
Works fine otherwise
Apple Store has run software on it and everything seems to pass.
It seems to shut down less when firewire is disconnected (back up hard drive LaCie) but still occasionally shuts down.

I have plugged my computer in three different places over the years and have had the same problem. I have also brought the power cord with computer for work and I am assuming they would have picked that up when they run their tests on the computer.
Could it be the keyboard (never brought in) or WiFi connection (don't think they would plug in anything)? A combination of this with load software/music?
Thing is the computer works perfectly otherwise. It is only does this when loading software or music from a cd/dvd.

IMac shut down suddenly and won't boot back up

This morning my iMac shut down suddenly. All I had open was Google Chrome and I was just on Facebook and that's it. When I tried to boot it back up, it wouldn't load past the startup sound, wherein it would appear to shut back down,or at the very least the screen would go black (my mouse has lights that stay on when the computer is on, and the light kept going on and off while the screen remained black). This was the case for at least a half hour until it suddenly booted itself back up all on its own. I had it on throughout the day, just browsing the internet and watching Youtube. It shut itself down twice during the day, and both times it restarted on its own right away after showing me a grey screen with the Apple logo and a progress bar. Now it just shut itself down again and it won't make it past the progress bar screen - if it even makes it that far, sometimes it shuts off right after it makes the startup sound. It keeps trying to boot up on its own over and over again, but it keeps shutting down right away. All the fixes I've searched for so far require a computer that actually boots up all the way so I don't think I could run any reports if I tried!
I'm running the latest version of Yosemite (10.10.2?).
Model number A1311
Not entirely sure what specs are useful to know so I'm just gonna write some of what's on the box it came in:
3.2 GHz Intel i3 processor, 4MBshared level 3 cache
4GB of 1333MHz DDR SDRAM
1TB serial ATA hard drive
ATI Radeon HD 5670 graphics processor with 512 MB of GDDR3 memory
Bought it around fall of 2010. Not sure if it's worth trying to get it fixed (I live nowhere near an Apple store) or if I should just get a new computer, but I would like to know what's wrong, if possible.

Try to boot into the Recover Partition by holding down the Command + R keys on startup. If it still won't boot then the HD has probably crashed. The is likely a AASP in your area, you can locate one by clicking AASP Locator, take it to one to be professional diagnosed. If it's only the HD, assuming you have been backing up, restoring to a new HD is pretty simple.

MBP shuts down when connecting to power

Since a week or two, my MacBookPro from early 2011 shuts down when connecting the magsafe to power. Also when starting up again it will start up fine and fast from battery, but I need to hold the power button for several seconds when connected to power.
Another problem I had earlier as well is CPU (kernel task) of over 90%, which I now see clearly, only occurs when connected to power. I used to solve this problem by putting the MBP to sleep, but now, when put to sleep, it will shut down.
When on battery, I have no CPU problem and can put machine to sleep without a problem.
I recently started uploading everything to dropbox, and activate caffeine to make sure it will keep uploading. My computer will run for days on power combined with caffeine, but is as slow as **** because of a >90% CPU.
The battery has had a notification for maybe a year, that it needed service, so today I finally bought and installed a new battery, but the problem is not solved. Is this software or could it be my magsafe adapter? Thanks for you help.

It sounds like a problem with the power management inside your MBP. I suggest you call Apple to make an appointment at your local Apple store for them to check it out for you.

First Gen G5 iMac: Shuts Down In Just Seconds

My first generation G5 iMac shuts down within about 30 seconds to several minutes upon boot up. I had it off for about 3 or 4 days days while away, prior to this it worked fine. I purchased it in November of 2004.
OS 10.4.8
I have it connected to an APC UPS, there was a lengthy power failure while I was away, but the iMac was off; it is connected to the UPS via USB cable, i've disconnected all unnecessary connections, opened up the iMac and blew dust out of it, but it still shuts down shortly after boot up.
Any suggestions would be appreciated.
Thanks!
1.8 GHZ 20 G5 iMac (Rev A) 1GB RAM/250GB HD Mac OS X (10.4.6)

Thanks all, and to Barry & MGW:
It looks as if my iMac is within the serial no. range of a recall for power supplies. My wife is taking the iMac to an Apple store today, she called Apple earlier this morning and got an appointment, also we have the AppleCare plan and are still covered. I will post again after the Apple Store visit with an update.
I use SuperDuper! It's a great program, unfortunately my last back-up is several weeks old (shame on me) and now the iMac won't stay on long enough to make a fresh backup.
Hopefully, a new power supply will fix things up and the HD will be untouched.

IMac shuts down as if someone unplugged it

I'm not sure what the "shutting down" problem is for others, but for the 2nd time in 3 days, my iMac has turned off as if someone unplugged it.
I use a surge protector so I don't think that's the problem, especially because I've used the same surge protector for several months without issue.
My guess is that because I haven't dusted the air vents (are they located along the crease in the back and towards the top?) at all, my iMac is overheating and thus turning off. I have a widget that tells me the temperature of various components of my iMac. I'm not sure as to the accuracy of the widget, but does anyone know what threshold of temperatures are unsafe? Maybe that could answer whether or not my iMac is overheating and thus causing the sudden shut offs.
Thanks!

When an iMac overheats, it can cause the computer to shut down.
Disconnect all devices from your computer except for the keyboard & mouse when troubleshooting.
See Knowledge Base Article http://docs.info.apple.com/article.html?artnum=86817 iMac G5: Loose power cord could cause power loss
Boot from your Hardware Test DVD. See what turns up if anything.
Consider updating to OS 10.4.10 & all the other available updates for your model iMac through the Software Update control panel if you make it to your desktop w/o shutting down.
See if your model iMac qualifies for one of the G5 iMac Repair Programs
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**
Which "model" & "generation" G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer
You can have this info displayed on the bottom of every post by going to 'My Settings' which is located in the column on the right under your name, and filling in the information asked for.
Thank you

Imac shuts down when not in use

I purchased my 21.5" imac July 9, 2011 with Snow Leopard. No problems for 1 month. Then about August 12th or so, my imac started to mysteriously "shut down" when not in use. I'll be working on it, then get up to go pour myself a cup of coffee or something...then I come back to my computer that has now shut off. It is NOT asleep...it is OFF. So I turn it back on and it is fine. This has happened a few times now within a week. Anyone else have this problem?
By the way, I am now running Lyon, as of August 18th. When the imac shut down, I was usually viewing photos or on the web.
thanks!

First thing I would try is to reset the SMC, it can help with power related problems. Shut down the Mac and unplug everything including the power. Press and hold down the power button for 10 seconds. Plug in the computer but be careful not to press the power button as you are plugging it in. Wait a few seconds and turn it on. Hopefully it won't happen again. There is always Apple Support. Don't let the problem persist until your free phone tech support has expired (3 months). I would also recommend using the iMac with an UPS, and at the very least, a high quality surge protector.
If you have MS Word or a similar word processor you could try enabling the autosave feature and set it to 1 minute intervals. Keep a document open and if you come back to the computer and it has shut down, you can look at the last time the document was updated and know what time the comptuer turned itself off. It could be useful in diagnosing the problem.

IMac shutting down, problems connecting to internet

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