My iBook G4 has suddenly started going to black screen. The computer is still on with apple light on cover still on. I have to shut down and restart then everything is fine, except sometimes I get a noisy whirring fan instead of a start-up and have to disconnect power or battery then restart again.
I have tried the 'Shunt' repair and things seemed better for a while but gradually (maybe a day or two)things returned to the original problem of black screen. My computer seems fine for about 15 to 20 minutes then more black screen. Please help!
-SickD