Upon powering up my Onkyo TX-SR605 receiver, it enters Audyssey setup mode even though the microphone is not plugged in. Even if I plug in microphone and remove it, it still stays in Audyssey mode and I cannot get it to exit Audyssey set up. When the receiver is in this mode it is essentially useless, as no other functions or buttons work. Any suggestions?

SOURCE: Onkyo TX-SR605 Receiver HDMI Issue

How good are the hdmi cables that you are using???

SOURCE: new home theater setup- no signal at tv using onkyo tx=sr605

Could well be the quality of your cables. if you have high end cables the consult a service agent. if you have the cables that came with the products, go and get some better ones.

SOURCE: cant find universal remote code for the onkyo tx-sr605

Your onkyo receiver and remote controller only decodes 4 digit codes so what you have to do is to call the manufacturer of the remote controller it self and ask for the hexa decimal codes for their remote. They should provide it to you coz they're the ones responsible on doing that.

SOURCE: Problem adding the setup code for Motorola VIP 1510

If none of the codes seemed to work try to communicate with Motorola and ask for HEX codes for their unit.

SOURCE: Onkyo TX-SR605 hdmi output jack

I haven't looked inside these or other similar units but if there is an extra unused input HDMI port next to the damaged port it may be possible to re-appropriated it as an output port by connecting the damaged port's wires to it after disconnecting it's factory wires. REMEMBER TO SEPARATELY SEAL THE DISCONNECTED WIRES TO PREVENT DAMAGE AND THEIR POSSIBLE FUTURE USE. Re-label the new port as the output HDMI and seal off the damaged port with tape (until replaced and reinstated). I strongly recommend photographing the original wiring locations for eventual repair to the original configuration.