@SwiftOnSecurity I had this on a ThinkPad X31 many many moons ago.. It stopped booting right and then I tried to fix it, opened it, and to do so I had to remove the battery. Fast forward a few weeks of not having time, and I figured that whatever supercaps were in there must be emptied by now so why not just try..

Booted right up.

When friends and family have weird issues, I default to removing power cables and batteries for at least 20 minutes, over night if they have the time. It works.