I got a Pioneer 5.1 receiver for free on craigslist, but it doesn't work. Every time I turn the amp on, the (what I assume to be) circuit breakers to the speakers close and reopen after less than a second, and this cycles infinitely of course. The fuses appear to be all fine. The guy I got it from told me it was plugged in when his house was hit by lightning. I thought the power supply fuse would blow in a situation like that, but I guess not.
Sounds like a bad power supply, or something else?