Thanks!, I think we narrowed it down to the g540. Pins 6 & 7 on the y axis shorted. My computer guy is saying that a mosfet trans. failed due to
overheating. He says for cooling that the trans. need to contact the case and some of them do not . He thinks some heat sink grease between the transistors
and the case would help. My enclosure has a fan, buy I was looking at Homanns 540 cooler. I'm guessing I had less than 60 hrs on this 540, I can't afford to keep
replacing it at this rate.