IMac starting and shuts down after less than one minute...

Hi !
I hope someone could help me with this problem...
I think I've tried everything... CMD+Alt+P+R / CMD+R / ... SMC...
I'm a little lost because I can't access to the computer (it shuts down before arriving on the desktop). I've also tried to access just to the hard drive by connecting 2 Mac with Firewire cable... And the same problem appears. The iMac is also shutting down to soon to backup anything...
Is there someone who has experienced the same problem ?
Thanks !
Best regards,
Jonathan.

Hi Jonathan..
Just to rule out any hardware issues, might be a good time to run the OS X Lion: Use Apple Hardware Test

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