IMac screen fades to white

Just bought a Core 2 Duo iMac with a 17" display. Plugged it in and started working through the "welcome" process... and then the screen flickered a bit and suddenly turned white. I restarted, got to the desktop screen, and then it gradually -- but quickly -- lost color until it became white again. Restarted once more but the screen continued to fade to white while I was calibrating the display...
Any ideas? My response is to take it back to the store tomorrow.
SP

Thanks. A few years ago, I would have spent half a Sunday downloading firmware, reinstalling system software, and trying to resurrect this computer. Today, I'm a true iMac user: I expect to plug it in and go. And go I will -- back to the store for a replacement.

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If that doesnt work try an SMC reset. Pull out the power cord from the back of the mac for atleast 15 seconds. plug it in again for 5 seconds and power back on ...http://support.apple.com/kb/HT3964
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