Ewwwww... I forgot how bad the TV speakers sounded.

Pulled out all the speaker wires, no apparent loose strands. OSD still didn't work even with speakers disconnected. Hooked the mains back up, no sound. Next step is to wipe the memory on the receiver, I guess...

[EDIT] Wiping the memory didn't help either. Off to the dealer I go. Hmmm... less than 30 days since I bought it, maybe return instead ?

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