Starting up shows blank screen, then nothing works

I was using my santa rosa MBP 2.4Ghz last night when every app started showing a spinning beach ball. I tried to shut down properly, but nothing would work, so I used the power button to shut off the computer. When I rebooted, however, all I got was a startup chime followed by a blank gray screen and nothing more. If I leave it the fans eventually start going nuts. If I press the power button it shuts off immediately (no need to hold it down). None of the startup key-combos work, and I've tried booting it off an external USB drive (which I just created for emergency situations and has successfully booted the computer before) but it doesn't work. I've tried resetting the SMC, although frankly I don't see how one knows if that works or not, but I did it. I also reset the NVRAM, which oddly did seem to work, even if no other key-combos worked. Any ideas?

This isn't a major addition to what I wrote earlier, it's just that I noticed that if I hold down the option key while rebooting I see the arrow cursor, while otherwise I never see the cursor.
I also didn't mention that I had tried booting in firewire target disk mode, but that didn't work.

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Starting up shows blank screen, then nothing works

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