On Jan 19, 2006, at 0:57, Rob In der Maur wrote: > Riba, I do have the original graphics card inside; didn't do any > upgrade. There were three "original" graphic cards inside, ATI Rage 128, nvidia 2MX and ATI Radeon. Radeon had a fan that usually died after a while and the card overheated. Same could happen with 2MX, less likely with Rage 128. > I once more tried several times to boot from the Apple G4 Cube > Hardware Diagnostics CD but this won't work from the MCE DVD-R > drive that I installed in the Cube. I really don't look forward to > replace it with the original CD-ROM drive merely just to figure out > what's wrong. > > Running TechTool's 4 Advanced Diagnostics doesn't show up any > problems with the Cube. I also have run 'memtest for OS X' (http:// > www.memtestosx.org/) in single user mode but also that didn't > report any issues. > > Any more help is appreciated. I am pretty certain it's the graphic card. Check the System Profiler for the card you have inside.