My wont my Onkyo tx-nr708 wont turn on? - Onkyo TX-8522 Receiver

http://www.intl.onkyo.com/downloads/manuals/pdf/tx-nr708_manual_e.pdf

https://www.sony-latin.com/electronics/support/res/manuals/W001/W0014790M.pdf

It sounds like the unit was disturbed by a power surge or blackout. Part of the controllers circuit was compromised and out of sync. The parts may be more expensive than a replacement unit.

I'll second what dennisae said. I've got a TX-NR708 that had all sorts of video issues after about 6 months of use until I got the HDMI board replaced. This seems to be an issue with this brand over a wide number of models.

try reset. push and hold vcr1 and then press power button while unit is on this will reset back to factory default

1) I bought the same Onkyo model from goodwill a couple years ago and it had the same problem. The solution is simple: Get yourself some Deoxit D5. This is a spray that will clean out all the oxidation in the volume pot. To do this you'll need to remove the cover of the receiver. Deoxit can be bought at guitar shops, or if you know a musician they might be willing to do it for you.

2) User manual is available for download, for free. Google "Onkyo tx-906 receiver manual".