My iMac starts up and then shuts itself down during the boot up process. it shuys down half way through the Apple logo appearing. any ideas how to fix?

Hi daveormond,
I'm sorry to hear you are having these issues with your iMac. If you continue to have issues with your Mac shutting down part way through the boot up process, you may find the troubleshooting steps outlined in the following articles helpful (given your description, it sounds like it could be either issue, or a combination of both):
Mac OS X: Gray screen appears during startup - Apple Support
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Support
Regards,
- Brenden

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Hi ...
I'm hoping that someone out there can help me ...
I purchased an Apple 24" iMac about 3 years ago ...
It was pretty much working perfectly until 2 days ago ...
The last time it was fully operational I'd just switched the computer on for the day - opened iTunes - and was using the FINDER to find approx 600 MP3s to add to iTunes ...
Whilst the FINDER was searching for the MP3s the iMac froze ...
So I decided to RESTART the computer by holding the POWER BUTTON to shut the computer down ...
I gave the computer around 10 secs to shut down ...
Then when I pressed the POWER BUTTON to START the iMac again it reached the grey screen with the Apple logo and the rotating dial ...
The computer then started emitting an audible clicking sound as if it was searching for / organising data ...
The sound eventually stopped but the iMac froze on the grey screen ...
So again I decided to RESTART the computer by holding the POWER BUTTON to shut the computer down ...
I gave the computer around 10 secs to shut down ...
Then when I pressed the POWER BUTTON to START the iMac again it reached the grey screen with the Apple logo and the rotating dial ...
And froze again ...
I followed the instructions contained within the EVERYTHING MAC booklet ...
I tried holding the OPTION key whilst starting up ...
I tried holding down the COMMAND OPTION P and R keys to reset the PARAMETER RAM ...
I also tried holding down the D key whilst starting up to test the Apple Hardware ...
My iMac passed the Apple Hardware Test ...
However every time I now try to start the iMac it reaches the grey screen (Apple logo / rotating dial) and then shuts down after approx 1 minute ...
Is this simply a boot problem ? ...
What alternatives do I have to boot up / correct the problem ? ...
I'd be ever so grateful if someone out there could help walk me through alternative actions to take ...
Kind regards ...

Hello
Try target disk mode see if your mac shut down from this way , to do that
hold hon at start up "T" on key board just after startup sound until screen show a firewire logo as screen saver
and wait ..
if by chance you have a second mac you can use a fire wire cable to link it , in that way your mac is like an external hard drive , most easy way to recover data from it
Try start in single user mode , use COMANDE - S at start up
Try start in safe mode , use SHIFT key at start up
if in all case you mac shut down after 1 or 2 min of use , certenly mean a mother board and or powersupply problem
be sure to have perform SMC and PRAM reset at least 3 times each
HTH
Pierre

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I know exactly what you are going through. I am almost 100% sure it has to be due to these other failures involving temperature. Mine is in this group. Here is a further discussion:
Re: 75% failure rate on 24" iMac hard drives?
created by John P. in iMac (Intel) - View the full discussion
As an anecdote, our 20" early 2008 iMac has been running fine since we bought it nearly three years ago. The AppleCare is up at the end of this month so unless Murphy's Law notices we expect another year or two out of it before we upgrade it. It's on probably 18-22hrs out of every day.
Reply to this message by going to Apple Support Communities
Start a new discussion in iMac (Intel) at Apple Support Communities
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