Multiple problems w/ iMac

Hi,
Today I had a big problem with my iMac. I already had Bootcamp installed, with XP SP2, and I wanted to install a new expansion of a game, The Sims 2. I did it, and started playing. 10 minutes later, the screen went black and all peripherals went off. The computer rebooted.
I booted again into Windows, and, when I got to the Desktop, the screen went black again. But, this time, it didn't reboot. I had to do it manually (pressing the power button for 3 seconds, and then pressing it again).
It powered up, but kept the white LED on, the SuperDrive working, and did not chime. I thought the culprit was the Sims 2 CD which was on the drive, so I spent almoust the whole afternoon figuring out how would I remove it from the drive. I tried everything: mouse button pressed, long periods with the plug out, the eject key, even a PRAM reset. Nothing!
I left it there, without any power, for some time. Then I reconnected the plug and it did boot. I ejected the CD via OS X, and it worked. But then, not even 2 minutes later, it went back to that black screen. And it started again...
Now, I can make it boot for some time, if I disconnect the iMac from the power outlet for a few minutes. But it keeps going back to the black screen, which I assume to be a kernel panic.
Should I send it to Apple? Its warranty is still valid, but the service here in Portugal is awful... (we don't have the official Apple here, only a 3rd-party company...)
I'm sorry for the long explanation, but I felt I needed to write everything for you to know the extension of the problem...

What you describe is not a normal kernel panic. I think that your problem has to do with a RAM issue; poorly seated RAM or bad RAM. Have you installed any 3rd party RAM or do you just have the Apple RAM that came with your Mac? I would remove the modules and reseat them. If that does not clear up the issue, if you have 3rd party RAM try the Mac with just the Apple RAM installed.
Intel-based iMac: Installing and replacing memory (RAM)

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    Hey Paysonite,
    A lot of questions hmm!!! Let me try to answer few of them.
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    ~Andromeda

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