Just hit this forum after my Onkyo 5007 runs weird and finally no sound. It all started with occasionally lost of sound after start-up. Google has a losts of hits on this common issue.
Not sure if my unit suffer from a faulty HDMI board as many other users are refering to, because the HDMI and all other video outs are working fine.
What I noticed running the set-up menu is some options missing, menu 8 is lost and in menu 7 subs 5 + 6 are lost.
The unit failed of course after my 2y warranty, I hope they will take it under repair free of charge as this looks like general design flaw from start....
I've got a ticket number from ONKYO support team EU and awaiting their reply.