Strange black and gray lines and lockup as soon as MBP powers on

I was surfing the web, and opened a particular tab when the 26" Samsung display that I use with my MBP yellowed and just weirded out in general. All of the colors funked out, and all kinds of plaid patterns appeared. Then I had a kernel panic. I disconnected everything from the notebook (FireWire hard drives, audio interfaces, USB drives, USB mouse, etc.) and restarted it.
Now, black and gray horizontally-staggered lines are all that show up on the screen. It happens immediately after the screen lights up. I've zapped the pram, tried to reset the video ram in open firmware mode, reset the SMU, tried to boot from CD, but nothing gets rid of these weird lines. Also, the computer doesn't appear to be doing anything (i.e. if I let it sit, it's still unresponsive several minutes later). If I hold down "Option" when I turn on the MBP, press the "right arrow" key and then hit "enter," the screen turns black and stays black, but caps lock starts responding (neither the internal nor external screen displays anything but black - in fact, the external display doesn't even pick up a signal).
Is this a problem with my motherboard/video card? I have finals coming up and can't really part with this - I hope I don't have to mail it off or take it to an Apple Store (the nearest is nearly 2 hours away). Any help or advice is welcome!

Thank you very much for that article! I'll be sure to print it out and bring it along to the Apple Store on Sunday. The problem occurs whether an external display is connected or not. I think it is a video card problem given that the screen immediately goes screwy; it doesn't wait until after the notebook posts or anything.

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