New iMac abrupt power loss/shutdown

I had my brand new, factory spec, 20' iMac set up & running for about 10 minutes before I tried playing a CD with itunes. When I pressed play the mac unexpectedly shutdown as if the power had been cut. I thought it may have been due to using a multi-socket plug so connected it directly to the wall outlet with the same result.
Other CDs & DVDs worked fine so I figured there was something wrong with that disc & carried on. Later I attempted to install a game it got to about 50% complete before the abrupt shut down, I tried another 2 times with the same results.
Finally I tried installing Leopard, the machine restarted as intended then after about 15 seconds of starting the install the mac again shutdown. Again I attempted the same thing a couple more times with identical results.
Has anyone else experienced the same problem, or has any ideas on what may be causing it & how to possibly fix it?

I too have been having random shutdowns occur while working - I seem to be able to repeat it by filling up the clipboard with large items cut from photos, and otherwise running photo shop with lots of image processing going on. I called mac support on this, and all they could identify was that I was getting hi mem tramps as a message on reboot. But, otherwise have yet to provide a fix.
This has been occurring out of the box since I got it in September. Annoying as I get dinged in the middle of my work.
Check your sys logs on the next boot up and see what you have there. Wonder if its due to bad RAM.

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