24" iMac Screen will not turn on. HD runs though?

Has anyone else experienced this issue?
I'm running the latest OSX(leopard) and also have Windows XP (dual boot) installed.
Well seems like the iMac could not stand the stress of my gaming. I was playing HL2 and it just shut down. I had to get the applecare guys to come over and swap out the power supply. The slipped in a beefier one. It had more heat sinks and prongs sticking out of it(way better than the old one). Well, they fixed it and didn't need to swap out the Logic board since it turned on by just replacing the power supply.
Basically I'm using the computer, I'm not gaming or anything and out of no where the screen goes black. Power is good, HD is running, I can even hear my music still playing... Basically, It's as if someone pushed the power button on my LCD.
It came back on after a few bangs and then recently it went out again. Banging won't bring it back and I really don't want to break it. I don't want to have to call the applecare guys on this one hopefully someone out there knows an easy fix. Or maybe just like the power supply I should have switched the Logic board. Maybe it was different and updated as well.
Thanks for all the help.

I am have experienced the same issue for the first time since I've installed the latest OSX(leopard) and ran the latest upgrade.
Basically I can use the computer remotely.
I have not call the applecare people yet.
Hopefully someone out there knows an easy fixl.

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24" iMac Screen will not turn on. HD runs though?

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