eMac random black screen - advice needed
I have an eMac G4 1GB, max RAM, OS10.5 Leopard. I have recently had the black screen problem. It randomly turns black, with everything running in the background. The screen then returns to normal a few minutes later. It sometimes runs for hours without a problem, other times it will happen several times a day. The machine runs perfectly otherwise... would be great to fix it if possible.
So far I have tried the following:
- Opened the eMac and cleaned the interior of dust
- PRAM reset
- Replaced the battery (which was dying because the date would reset on unplugging).
Are there any other straightforward things I can try, or is this most probably a hardware failure and ultimately a write-off?
Any ideas appreciated.
eMac 1GHz, iBook 14, Mac OS X (10.5.8)