A few years ago, I had a problem with my A530's PSU. I replaced both A530's, and the A500's PSU's by running them both off a single 200 Watt ATX PSU.
I can open the PSU up and let you know how I wired it if you want - (can't remember exactly from memory - 10 years ago). I dp remember it wasn't very complicated, although I do think I was sober at the time....
