The video for our 2006 Gateway GT5220 PC has stopped working. The PC boots as the XP Pro Windows startup/shutdown and Avast themes can be heard. The motherboard has already been separately replaced and repaired once about 2 yrs. apart. I've tried removing and reinserting the RAM. That worked once. I bought and installed new RAM. That had no affect.
Please suggest a solution for fixing it, or how I can determine what motherboard will fit the case so I can substantially upgrade the motherboard, RAM and processor.