well you could take your PSU apart, and check this cap as in this thread:

http://68kmla.org/forums/viewtopic.php?f=8&t=20074&p=191365



Hey, how did the IIsi work before you sent the board to me?

When I tested it after the re-cap, it worked outstanding. - I had to scrape some flux off the bottom pads for the

Power Light / Speaker Combo, I started always reflowing those pads after mcdermd's run in with a sound chip IC issue, with a IIsi

Charles