I've had a TX-SR606 for several months but have hit a problem. Not sure if it's a fault with the box or a setup issue. Looking for some suggestions on my current diagnosis before I send the unit back.
I have the following connections...
DVD player via HDMI 1 mapped to DVD input selector
Audio via coax digital
Cable Box via Component 2 mapped to Cable/Sat input selector
Audio via optical digital
Camcorder via Aux (Composite)
HDMI output to Plasma TV
HDMI output configured to 720p.
Up until last week everything worked fine with that configuration. The cable box and camcorder were upconverted to HDMI. On screen menus also worked fine.
While I was I was on the road for a week the video from the Cable box disappeared from the monitor, though DVD was fine. Maybe someone pressed some buttons randomly - we have such people in our household - details withheld to preserve domestic harmony

.
Since returning have tried to troubleshoot. DVD through the Onkyo is fine. No problems with the cable box itself - tested direct connection to the TV via component: works fine. Camcorder via Aux also displays no Video - though audio is fine. On screen displays from the Onkyo don't work either.
My suspicion is that all conversion to HDMI (composite, component and on screen display) has failed, but wanted to check the wisdom available here if I'm forgetting any possible setup options that might affect this. Any ideas?
Thanks
Will1593