IMac not booting - thinks its too hot?

I've just dug out my old G5 iMac in order to reformat the drive and pass it on to a new owner, and after a brief period of working fine it has more or less died. Here are the symptoms:
• Won't start when the power button on the rear is pressed.
• On the motherboard, LEDs 1 and 4 are lit (after attempting to start up).
• It makes no difference how long I leave the machine - it still fails to start.
Now, I believe LED 4 indicates overheating - but while the machine could conceivably have got too hot on the occasion that it died in the middle of copying some files, it is clearly now giving an erroneous temperature warning. Is there a sensor I can replace? Something to reset?
Any suggestions gratefully received!

http://docs.info.apple.com/article.html?artnum=300908 *Troubleshooting when your computer won't turn on*
http://docs.info.apple.com/article.html?artnum=86817 *iMac G5: Loose power cord could cause power loss*

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Hey guys,
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Richard Walker.
p.s. I have a broken superdrive and i am running the latest version of leopard.

amitabh wrote:
It seems odd that apple would send out an update that would cause this kind of a problem.
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I agree with baltwo, If your Macintosh is behaving erratically or is not booting up all the way, you may want to try resetting the PRAM as per below;
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2) Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3) Turn on the computer.
4) Press and hold the Command-Option-P-R keys. You must press this key combination before the grey screen appears.
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6) Release the keys.
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I think I found a solution. But perform these steps at your own risk. And thanks again to J.C above!
First download the latest beta version of Onyx for Mac. Verify your disk, SMART status, etc. Then go to the cleaning tab and check off everything. Clean out all the caches. Now you can use Onyx or Disk Utility to verify and repair permissions.
If you have and iMac, you should reset the SMC by shutting it down, then disconnecting the Power Cable. It also doesn't hurt to hold the Power button down for 15 seconds. Then wait a minute, reconnect the power cord. Then reset the PRAM. For my Mac, I had to switch on my keyboard, turn on the Mac, then quickly hold Command, Option, P and R while booting. Hold them down until you hear the Apple sound twice.
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Just a few hours ago, Mail started acting up on his machine and I tried to help him. The symptoms, if they're at all relevant, were that a new message composition window wouldn't close if he clicked the "close window" button, and the send button was greyed out. I recommended a restart.
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At this point I'm completely puzzled; I've browed fora and message boards, and so far, nothing I've tried seems to work. My friend is reluctant to go to the Apple store, as he thinks that he'll lose all of his data that way (even though he's got a backup disk set up, with backups from just before the restart, going back about a month). Fact is, I'm not sure that there is a solution at this point, beyond taking the machine, which is still under warranty, to an Apple store.
What would be a good course of action at this point?

I tried starting up in safe mode. The loading bar showed up, filled up, and disappeared, and then, nothing. Just the Apple logo, for at least 20 minutes (I later restarted and tried zapping the PRAM, also without success).

IMac not booting up - getting stuck on blue screen

Hello, first post here.
I have an iMac which I powered down last night and came this morning to boot it back up. Unfortunately it was having troubles booting up. It got stuck on the blue screen, kinda switching back and forth between two shades of blue and occasionally displaying the mouse and spinning load icon.
I tried restarting it, and curiously there was no startup sound. I tried unplugging the power cable and plugging it back in holding the power button and turned it on with the fan going full blast. I rebooted again, the fan was silent, but the startup sound finally chimed. I then proceeded to try the following:
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•Tried booting in safe mode - stuck on gray screen with apple icon
•Tried booting into target mode - drive was recognized on my macbook fine
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•Tried restarting it in single-user mode, worked, repaired the disk through that, rebooted and still no luck
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Whats interesting is that the hard drive isn't making the usual mechanism sound that I usually hear when its powering up (assuming that's what makes the sound)
So any help is much appreciated. I use this computer in my recording studio and have lots of data I wish not to loose, so any solutions needing a reinstallion/erasing the drive is fine, just keep in mind I need to do a good backup first.
Thanks

Hi J
Welcome to Apple Discussions
That sounds almost like a failed Leopard install:
http://support.apple.com/kb/TS1545?viewlocale=en_US
or it's Stuck in a "loop" at the login window after upgrading to Leopard: http://support.apple.com/kb/TS1413?viewlocale=en_US
Try an Archive & Install:
http://support.apple.com/kb/HT1710
or restore from your Time Machine Backup:
http://docs.info.apple.com/article.html?path=Mac/10.5/en/15638.html
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Early 08 iMac not booting - You Need to Restart Message

So after lunch today, I touched the shift key to wake up my iMac from sleeping. Screen came up, but it was totally frozen with distorted green digital "crud" in various places in the display. (no other way I know to describe the green stuff, it wasn't consistent lines or anything...just random distortion).
I powered down to restart, and the following message came up http://gallery.me.com/daveoli#100064 advising me I had to restart again. Did so, and same message. Tried the following methods, all resulting in the same message coming up:
Unplugged completed, waited an hour (in case of overheating) and powered-up.
Booted holding D key for h/w test - no test just got same message.
Booted in safe mode.
Booted from CD.
I called apple support, and the tech advised me to boot holding down cmd-option-r and then p to reset pram. 3 bongs, and then release....this worked! The mac booted up. First thing I did was connect firewire drive and make a back up. Ran a disk check with disk util and everything was ok. I then started to download the hw util from the mac site...and wham, screen froze again with the green crud.
This time, restarting with the resetting the pram did not work. Nothing gets me to progress beyond that "need to restart" screen. I will call Apple again in the morning...but in the mean time, any one here have any ideas or have seen this issue before?

That's a *kernel panic.*
They are usually caused by hardware problems, but can be software.
Disconnect all peripherals, except keyboard and mouse. Reconnect one at a time to see if you can find the culprit.
If that's no help, run the Apple Hardware Test, from the separate disc that came with your Mac.
more kernel panic info:
http://support.apple.com/kb/HT1392
http://www.index-site.com/kernelpanic.html
http://www.thexlab.com/faqs/kernelpanics.html

IMac not booting - thinks its too hot?

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