Are you 100% confident there are no single strands of wire shorting the speaker terminals left over from the last time you hooked up the speakers ? It doesn't take much to trip the protection on a 630, trust me on this

Hold on -- you can move the receiver to other houses and it's OK.

Next question -- have you stuck one of those cheapo ground checkers with 3 neon lights into the outlets in your house ? Sometimes a bad ground (or, even worse, a ground with some power on it) can do this.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8