I recently thought my PC had died. It would hang on the BIOS splash screen. I posted a call for help in one of the forums and got lots of advice. One was that the power supply might be a problem. A power supply tester showed the voltages to be spot on. Another recommendation was to check the memory. I have four memory sticks. I did some removing and swapping around of the memory sticks. It still would hang on the BIOS splash screen. I tried another video card and that didn’t work. I unplugged all the disk, USB devices, etc. and I was about to give up. I started to build a list of components for a new build and was ready to disassemble the system for recycling and spare parts. It bothered me that it wouldn’t even let me get into the BIOS. I finally remembered that the mobo had a pair of clear CMOS pins. I shorted the pins and it went into the BIOS. The BIOS screen even had a list to select how to proceed. One was to use the last known BIOS save. I did have to change the primary boot disk selection, but now all is well.
I’ve been doing my own builds since the late 1970s and I’ve never had a need to clear the CMOS. My first build required that I solder all the chips onto the printed circuit boards. The system came as a kit with bags of chips, resistors, caps, etc. and unpopulated PCBs. It had an 8 bit Motorola 6800 processor that ran at 1 MHz with 4K of static RAM. I’m still planning to do a new build after Intel releases the next generation of CPUs. I still have my first system build in the attic collecting dust. Here is a link to some pictures of the systemhttp://bit.ly/1CCdiXo