Welcome to the forum!
I doubt it, but you wouldn't happen to have the receiver muted, would you? That wasn't meant to be patronizing - just want to cover all the bases.
I looked for a reset command but didn't find one, so (if you haven't already) I suggest unplugging it for a while, perhaps even overnight, and seeing if the system will reset and start working. The fact that you get hiss from the speakers tells me that the amps are still functional (but you're comment about having to turn the volume way up to hear it made me wonder about the mute being on).
Btw, I still have my RX-V992 receiver from back then, too.
I haven't used it for years, but it was a nice receiver.