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Most probably you have one of the power amplifier modules bad. They are the PAC010 and PAC011 type. You can remove one and power up the receiver. If it powers-up normaly it's that one.... (50% chance) Otherwise remove both and it should power up normally. Beware that these parts are expensive... Most times just with a new part the problem is solved. YMMV. Good luck
Rear Surrounds are not supported on this unit, they would be the 6th and 7th channels in a 7.1 rig. I think you mean Surrounds (channels 4 and 5 in a 5.1 rig).
Lets ponder: How is there any relationship between Surrounds and your separately-amplified Subwoofer? I don't see it, unless you inadvertently chose OFF for the Sub definition when you were in the Speaker selection menus adding the Surrounds. Look again.
clean the all push buttons by using isoprpylalchohol.(surgical spirit)and dry well .i think all the buttons are short by itself.the problem is still there please check the power supplu secondary side smoothing condencers related to system control power section.
I recommend you use an optical connection. Your VSX-D510 has only one optical input, but I believe it is assignable. Use a good optical cable and connect directly to your DVR. Follow the manual to assign the input and it should work.