It's definitely some sort of flaky hardware error. Just running normal applications, Firefox, Disk Check, whatever, causes the CPU to spike to 100% and stay there for awhile. This box had been running fine for quite awhile and nothing changed with the system (except being in a powered off state for a couple of months [i moved]). I'm still running at Mame v.106 and everything runs great now on the new hardware. I only use GameEx for MAME, Daphne and some PC games, so redoing the config isn't that big a deal to me. Moving the 15GB of ROMS, reinstalling Lego Star Wars I/II, NFL Blitz, WinIPAC, etc. were bigger hassles.