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I did test the oscilator and did see a good signal from it. I also did go through most of the caps and tested them, the only ones which were questionable were the 100uf caps. Since I had them on hand, I went and replaced them all as well and no change. I have a Power Mac G3 here which does...

I have been doing digging and the issue I think stems from the CUDA chip. According to the 6500 schematic, it controls the power LED on the front of the computer. Being that it’s not coming on, I’m guessing that the issue surrounds the CUDA chip. I have a power pc g3 with the same CUDA chip...

For me it’s definitely not a thermal issue on the CPU. During cleaning I did remove hestsink, clean ir and apply new thermal compound.

Interesting, have you tried measuring the voltages off of the power supply while it’s acting up? I did check voltages after it was powered on and the 5v, 3.3v and 12v rails seemed okay. Unless there was a dip that caused it to crash. Ive been trying to dig up any info on in depth...

omidimo, did you ever figure out the issue with your 6400? I've got a 6400/180 that i'm working on. It was a former home to a mouse, and I literally had to clean everything inside. No corrosion, but I get the bong on power up, no video, no LED on the front module, and is unresponsive to zapping...