I have a Denon AVR-890 that's a couple years old. In the past few weeks it has started exhibiting a behaviour that I've been unable to resolve through cable swaps or microprocessor resets.
When I first turn the unit on (bringing it out of standby), there's no sound at all, for any input. I have to turn it off, either putting it back in standby or turning it completely off with the power button, and then back on to get sound out of it.
Additionally, the volume control video overlay randomly stops displaying for the DirecTV box, but not the PS3 (that I've seen).
It vaguely seems like this behaviour started after I had the unit unplugged for a while to move everything to a new AV rack; everything also got re-cabled during this effort. I've checked the wiring and gone through the setup process again to validate that all the speakers are connected correctly and functioning properly. Everything seems to be in-order.
I've tried unplugging it for a time and gone through a couple microprocessor resets now, to no avail. I've also double-checked the headphone jack and ruled that out.
The firmware versions are .64 and .24; these aren't the newest versions out there, but they've worked well up until recently. I haven't introduced any new hardware, though I'm sure both the PS3 and DirecTV boxes have periodically updated their firmware.
Any ideas, things to check, things to try?