My Onkyo TX-SR506 plays cable and CD inputs to zone 2, but DVD won't play. Everything is connected according to the manual and I assigned zone 2 output correctly. What gives?

SOURCE: i have a onkyo tx-sr506 receiver that turns it self off

This unit is in protect mode. This means that a problem was detected and the unit has shutdown to prevent further damage. The most common cause of this is failed output transistors. Plan on $20-$40 for parts for this repair.

Dan

SOURCE: Onkyo Zone 2 problem

The zone 2 will only play analog sources - so  you must hook up the output from the tv/cable/dss on it's analog (RCA Jacks) into an input on the Onkyo.  You might also have to enable this output from you tv/cable/dss.

SOURCE: ONKYO TX-SR606 Single output to TV

Hi there. for your receiver, the only time it can upconvert is when you go out as HDMI. In your current hookup (component out to tv) the signal from your cable (using a composite) will not be able to pass through the component cable. This means you either have to hook up your cable box using a component cable as well or add a composite cable (yellow) from monitor out of the receiver to the tv. Page 22 of the manual will show a diagram of the video signal flow. hope this helps.. ^_^

SOURCE: Onkyo TX-SR705 - No Audio - Flashing HDMI

The posabilities is power amplifier on your reciever is bad,
replays reciever or repair it.More likely this is IC amplifier located on the main board of the reciever

SOURCE: I have an Onkyo TX-SR605 AV receiver that just

Goof information. Have you eliminated or proven the Onkyo as a cause by going direct to the projector? Try another Input and/or Output. It's best to know which component is broken and if it's limited to a specific subset of its function.

Settings are also indicated. Run through the video setup again. If it just stopped, what preceded it?