the fans on the Peter Chou box power supplies are not very good quality and often seize up. you can still run it without the fan, but all the capacitors and components encased in that little metal box will eventually heat up to the point the capacitors are junk.
reason enough why I choose Happ PowerPro over those, even though the Peter Chous are nice units -- it's just not a useful way to occupy my time replacing something that shouldn't have to be replaced.
I think the Big Blues use the larger 150W ones, probably with external power switches (there's 2 kinds) .. if you need assistance matching up part numbers through Happ just drop me a PM later with pictures of what you have.
good luck