Today I had a crash in GroovyMAME while I was playing Progear.
Here's a screen I captured:
Basically what happened is that the game got stuck at the first boss and the screen and audio remained still for ~10 seconds, then the screen turned black as if no signal was send but the game continued playing because I could hear the music going. So I close MAME and the screen I posted is what I got, along with garbage on screen behind the window.
RAM is ok, tested with MemTest86. Same with the hard disk, which I tested with Seagate SeaTools to see if there were broken sectors. I then low level formatted it and installed everything which went smooth.