I've been playing around with one of my old PCs recently, an IBM PC 340, and at some stage in trying to get a compact flash adapter to play nice I hit a weird issue where the system BIOS (a Surepath BIOS with next to no settings) started reporting the HDD size incorrectly as ~350MB instead of 850. I decided to reset the BIOS, and since I had to take just about everything out of the machine to get to the jumper I also upgraded the CPU from a P100 to a P166. While doing that I neglected to move the reset CMOS jumper back to it's standard position and powered up the machine.
I realised something was up when aside from getting the "settings have been reset" message, which I expected, it also complained about the battery, which I know is good. It did correctly report the new CPU speed and HDD size though. I powered it off, moved the jumper, and fired it up, only to get no display. Now it seems I don't get a display or any POST beeps unless the clear CMOS jumper is in the clear position or not on the board at all, in it's usual place the machine is just seemingly dead.
Based on what I'm seeing I'm guessing I've done some damage, but where? Presumably the CMOS chip, but what are my options from here?