Day187,
found something today. I replaced my CPU fan which required pulling the motherboard. After reinstalling everything I was getting some of the same problems you described with CC on the CMOS code. PC would boot and would allow me to go into the bios but would not save the changes. Then several attempts would not boot at all. I discovered that the CMOS switch in the back of the motherboard was in the correct position but you could just touch it and you would get the CC code. It was like a short. I was able to get the switch to set correctly but I had to do it while the power was on and watch the code. After that I had no problems.
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