I have an Intel D865GBF motherboard and if I remove the cmos battery, then reinsert it, the system will then turn on and power up into win2k.
I can then reboot it fine.
However, if I do a shutdown and power the computer off, then try to restart it, it won't boot. the fan will start to spin, then shutoff.
If I pull the cmos battery, and put it back in, then it will restart again.
I have replaced the Power Supply and flashed a new bios to try to resolve, with no success.