Earlier this year, I got a HP Z800 workstation computer for dirt cheap, $250 or so, off eBay. It's a pretty well configured machine, 2x X5675, 48GB, etc. It was purchased for my 3rd grader son to play, learn, and do homework on. It's worked great until about 2 weeks ago, where it now randomly resets or shuts off. Searching online, this seems to be a common problem with HP Z800 power supplies; some claim bad capacitors. I'm not shy of doing such repairs myself, but in this case, I tore apart the PSU and found no visual signs to indicate which capacitors may have gone bad, or if it even is a capacitor issue. The PSU tests fine in standalone, but when there's a load, *sometimes* it shuts off, or cycles between on and off repeatedly. There's a clicking sound, sort of like a relay, and my guess is that it's some protection circuit that is flipping the relay. I'm wondering if there might be other STH members here familiar with this issue that I can discuss this with? I tried to throw money at this problem, but ended up with a used PSU off eBay that was in worse shape. I figure if I can fix the PSU with high quality components, that might be a longer term fix. Anyone?