The PowerBook was working PERFECTLY fine five days ago

, and then about three days ago, I was running in single-user mode, the computer froze

. I restarted--no boot chime, just loud fans and the Superdrive spinning. Same thing every time I've turned on and off the computer, or restarted. Then I've given it a rest for two days, and now It wouldn't do a d*mn thing, no fans, NOTHING. I thought it was something wrong with the DC battery board, but when I plugged in the power adapter, it charged the battery like nothing bad happened to it, but it still refused to boot!

I believe there's still some life in it though, because I tried resetting the PMU, and the green light appeared on the charger, and about two seconds after I released, the amber light indicating the charge returned. It may just be a motherboard issue. Any help?
