I have a Dell Optiplex GX270 that asked to have the bios defaults reset on every power up. Assuming I had a weak CMOS battery, I measued the voltage and sure enough it was .87 volts. I obtained a replacment and put it in. Now, the PC will not do anything when I press the power on button. No bios load, no video bios load, no fans, nothing. Putting the old battery back in does not help.
I think the actual bios code must have gotten corrupted when I replaced the battery. Something in the back of my mind tells me there is a way to force the bios to reload its code and default parameters on power up. I've done this before adn used some combination of keyboard characters. But, I can't remember what.
Does anyone have a better recollection than I???