Man, I have the worst damn luck...
So I got a replacement amp while I was home on break, and just got it up and running tonight. First thing I notice is that there's a constant-level hum in the right channel, but it's not too loud. I figure it might be a ground loop or something that I can diagnose myself. Music sounds great, and there's no channel imbalance.
So I leave it on for an hour or two (it's 3am now, I had it on since 12:30 when I first turned it on) while I'm visiting a friend's room. I come back to find that not only is it humming on both channels, but the LED is off and it's dead again. I can't even believe it. Do I have killer power or something? What in the world is happening with this amp?