The manual is here:
http://www.retrevo.com/s/Onkyo-TX-SV525-Receivers-review-manual/id/365bh226/t/1-2/
Power it OFF before handling any wiring.
You could verify if any speaker wires being shorted is the problem by just disconnecting all of them and trying to power it up. If it fails to power up, it's sick and needs a hands-on tech to look at it.
If you don't actually SEE the problem while disconnecting the speakers, but the receiver DOES come on, try reattaching one at a time until you either have found the offending speaker/wire combination or you have success in turning it on and using it.
Speakers can be shorted, too. So if you locate a channel giving you trouble, say, front right, you could swap a different speaker or wire set into its place to prove if it's external or internal to the receiver.
Going forward, make sure you don't run the unit too loudly and give it plenty of room for cooling ventilation.
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