[snvzz]

A500 PSUs (particularly the 2nd one) are the most reliable and powerful.

The A500 themselves are built like tanks. Chances are it just works.

But watch out for trapdoor expansion. Most likely has a varta barrel battery in it, which will eventually leak and damage the expansion, and possibly also the computer itself.

I would recommend opening that trapdoor and removing/inspecting anything installed there as soon as possible.

These barrel batteries are only used to keep RTC, and the board will be fine w/o.