QUESTION: flashing power button at startup/won't start

I just bought this Imac intel core duo 2. it worked fine for the first couple of days. Now, when I try to turn it on, the power button (in the front pannel) starts flashing and the machine won't start up :o(
Anybody has any suggestions how to fix this problem?
Imac intel core duo 2   Mac OS X (10.4.7)  

Thanks for your quick response Pete!
I definetely feel like I should just bring this back to get a new one since I just got it. Although it went on, once I shut it down it would take me quite a few tries to start up again. Kinda frustrated cuz I got tons of school work to do.
Have a good night! (midnight in nyc)

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