Hello I have a http://www.everymac.com/systems/apple/powerbook_g4/stats/powerbook_g4_1.67_15_hr.html . She's a very nice machine but the screen goes black 2 minutes after boot sometimes 20 minutes. Sometimes it doesn't freeze at all. It has a fresh install and I can't reproduce the problem, it just happens at random times.

Any ideas? I would like to hold onto this machine and keep it in top condition. Have you heard of this before, is it worth buying a new battery for this troubled Powerbook?

Symptoms:

Black screen, fans normal speed, unresponsive. Computer does not seem hot and the computer has crashed a cold start.