Scared to turn it off - imac reaches login screen, then shuts down

My imac recently developed a problem on startup. I see the folder icon with question mark on it for a moment (never used to see that), then it gets as far as the login screen and then goes dead. When I press the button to restart it, nothing happens. If I leave it a while, and/or reseat the power cable a couple of times then it will start ok, if I'm lucky!
So I was leaving it on all the time,which seemed ok, but I enabled the "put hard disk to sleep option" last night. This morning it went dead when I tried to bring it out of sleep mode.
I have taken the back off and checked the diagnostic LEDs. It had LED 1 on ok, and when I started it up using the internal button, it got as far as 3 LEDs, then went dead again.After going dead, no LEDs.
After trying a reset, I put the back on again and eventually (pressing the button and waiting, then trying again a few times) it started ok.
So now I have disabled the hard drive sleep option and left the computer on -I really am scared to even put it to sleep!
Sorry for the long post, but I would appreciate any advice here.
Thanks
Message was edited by: Nigel Switched

It turned out to be bad capacitors again - bulging and leaking ones in the PSU.
I am very annoyed about this as the power supply was replaced under Applecare cover just over 1 year ago, along with the midplane, which had - you've guessed it- bad capacitors that had leaked.
Anyone want an expensive doorstop?

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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
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MarkusLarockus wrote:
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