I'm trying to narrow down possible problems with this 486 mainboard that seems dead. The PSU had a blown varistor that I replaced and it seems to work fine now. I did try with another PSU, but didn't get any further. On visual inspection I couldn't find anything wrong with the board, but obviously there's something. I swapped the CPU and tried different memory configs to no avail. I'm pretty sure the clock chip is dead, but that itself shouldn't prevent POSTing. The only sign of life I get is that keyboard lights flash when it starts and the CPU gets hot (too hot?). Any thoughts or should just let this one go?