Imac keeps turning itself off

imac 20" intel core duo, 2G running leopard 10.5.8
imac will turn off randomly and won't start again unless its left for a while, it's no getting hot (that I can detect)
So far I have reset the SMC
run the AHT which came up with nothing
tried another power lead
tried it in different power outlets
Any clues people?
thanx in advance!

i'm guessing a faulty power supply as the likely problem.
i had an iMac 20", although not an Intel (mine was the last of the G5 processors, yours might be the first of the iMac Intel machines?).  it had the same problems as you've been experiencing, which were caused by a power supply problem. it was replaced by Apple; even though i had AppleCare, Apple had a special extended replacement program in place for faulty power supply boards installed on that particular machine.  the replacement power supply failed again a few years later, exact same symptoms.  that time it cost about $150 or so.
good luck.

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