Right out of the box...and it KEEPS SHUTTING DOWN!! Help!!

I received my brand new iMac this afternoon and plugged it in. It was working fine for about two hours, now all of the sudden, the thing will not stop shutting down and powering up. It is almost as if I am jiggling power source on and off, like a flicker, and I am not even touching it. I tried troubleshooting with the cosmetic ring around the power connector - no dice, the computer keeps turning on and off like it's posessed. There is plenty of slack on the power cord so it's not being pulled. I am afraid plug the system in...all that shutting down and powering up can't be good for the system. What should I do?
IMac   Mac OS X (10.4.8)  

Welcome to the discussions!
If you have checked that the power plug is firmly seated and confirmed that it is, then the only thing to do is to call Apple or take it in.
If there is a problem with the power supply or logic board, Apple should replace the entire unit. No new Mac fresh out of the box should require repairs.

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