IMAC Keeps on shutting down

I recently bought an IMac having always had PCs. I adore it now some of the initial teething problems with the HDD have been resolved (back up, clean disk, and rebuilding from scratch with a new copy of Snow Leopard)
Disk Utility now runs clean and the same can be said for ONYX.
But it keeps on crashing (since purchase - every couple of hours, or every few seconds).
This is putting me off the whole transition (not before I bought the NANO, Apple TV and various Software applications). It is out of warranty, and I have tried everything on this site - I would take it into a repair shop if I knew this could be resolved.
I am desperate for advice as I am looking like an idiot every time I try and show family/friends how kewl it is...
Cheers chaps, Soph

Post the first 50 lines only of the crash report
Regards
TD

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I am running the latest update of OS10.6
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I have used this configuration for years without a problem.
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reset the PRAM
reset the SMC
tried different outlets in the house in case of a wiring problem in the house
removed and reseated both 1GB RAM chips.
tried different configuartions of my external hard drives
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Welcome to Apple Discussions
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return it

IMAC Keeps on shutting down

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