Blinking standby button

have you attempted to unplug it and plug it back in 2 mins later--sometimes a hard reset is all thats required...

Check the Ohm value (4, 8, 16...) on the speaker and on the ONKYO too.
If not the same that is the (big) problem!

The only thing to test would be to disconnect all speaker wires at the receiver then turn it back on. If it still won't turn on, it's an internal power supply issue and will need service. If it turns on, post a comment and I can walk you thru further troubleshooting. Hope this helps

Its possible that the Receiver is going into protection mode and possible some speaker cable might have touched the body or with each other.
Remove all inputs and outputs and then restart the receiver. If it starts then you are lucky. Connect all cable and wiring properly and ensure that they do not touch each other. You might have to reset the microprocessor if the recevier has got.

If the problem persist then let me know to further the trobleshooting.

Please do rate this solution and thanks for using FixYa.

bad unit in power take it back if u just got it my fav is harmen kardon and kenwood 7.1 thx good prices too does everting way it should last forever

If the unit will not leave standby I would remove all power, disconnect *all* connections at the back, reconnect to a power source and try powering on. This will eliminate any connection causing the Onkyo to stay in standby due to a short. If it still will not enter power-on mode, you may want to look at the power source (is it properly grounded?), but beyond that the unit probably needs to go back.