ThinkPad R40 Still Freezing

I was hoping that my labored BIOS upgrade would yield a completely stable machine. It locked on me again today, though. As usual, it ran for 3-4 days, then froze about 5 minutes after resuming from swsusp.

I happened to be at my logging console this time, instead of in X. I got one lone odd asterisk thrown in an odd place on the screen -- usually, I'd see some slight corruptions on the X screen. The cursor still blinked, but none of the SysRq key combos did anything.