I haven't checked the voltages because the fan doesn't start up, maybe that's the problem now that I think about it.

< . . . staggers into kitchen to service coffee maker and peer into monstrosity . . . >

I yanked the XGA-2 card & found the notes I made as to which slots the cards were in originally on the previous page. I finally downloaded the reference diskette file Unknown_K linked, thanks, K!

Now I get two thumps out of the speaker like you do, no tink tinks, but still no fan. Next step is to make sure the cards are in the original positions. Maybe I'll try another power cable or two first. The one I'm using is known good, but I've had problems with PSU/Cord connector incompatibilities in the past.

I'm also wondering if the battery wasn't quite dead when I got it two years ago.

Does yours have a reference disk in it and is it hooked up to the proper monitor or a good MultiSync that can deal with the interlaced signal?