IMac powers down often

My iMac shuts down by itself sometimes. It wont go back on unless I remove all the cords in the back...power, network, usb's, etc... then it goes back on. Any advice?
I have apple care - if I go to genius bar and service is needed is that covered under apple care?

Generally, this is an issue which indicates that your power supply is defective.
AppleCare extensions to the original warranty cover the costs of parts and labor to replace such a defective supply.
You did not indicate which specific iMac model you have, but posted your inquiry in a forum for iMac flat panel models based on the G4 processor, none of which could be presently covered by a conventional AppleCare policy, as all such machines were manufactured and sold more than three years ago.

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    i am having issues with my Imac Powering down. i have had a tech review my computer and they say nothing is wrong.
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