Speaker wires accidentally touched.

"I accidentally touched a speaker wire to the metal spikes on the bottom of my speaker. " This action makes +B voltage (positive voltage) short to ground. You may assume 2 power transistors mounted on a large heat sink are defective. Now try to remenber which speaker terminals was accidentially shorted. Then check this terminal or you should check all power transistors mounted on the heat sink, by measuring the collector and emitter resistance. Normal value is Mega ohms and all white 3 pins resistor with 0.22ohm should also be checked if they are open( infinity resistance).I have tried to reset it several times to no avail. Of course, due to defective power transistors. Is my receiver done? Yes. I wrote detailed troubleshooting steps used in onkyo service dept. a year ago, just find it out in my answers.

For your case, DET. PROTECT: I instead if entering debug mode.
NG L R BL BR, This amp is under DC protect.

If I had to guess by touching the positive and the negative terminals together it probably fried up the transistors. While back I did the same to my amp and poof amp no longer worked. Took the amp apart to find the transistors fried up. Ordered them from the manufacturer but never installed them, ended up buying a new amp. Mainly, replacing the amp doesn't mean it would fix the problem....

you can find fuses inside the unit

I doubt the extension cord has something to do with that...Usually if the wires are short it would effect the main unit. Check the wires first,not only of the front right speaker but the others also...if they are short. If there's a fuse in the main unit you might find yourself lucky...otherwise you will have to get it checked by a mechanic.

Check your connections again. Check that they're connected correctly. Look at a diagram, check the fuse on the power (red) wire from the radio. The radio might have fuses on the back of it, check them too. If anything put and tape every thing back together and use a harness then go from there.

very basically try swapping over the speaker cables, if this doesnt work i suspect you are in need of a new ouput i.c. these can go if the speaker wires are touched together, unless there is a protection circuit.

That is a very nice amp . Try not to touch (short) those wires together. But yes, the amp has protection and is shutting off to protect it.

Check the fuse. If its not blown rewire the ground to bare metal.  make sure the power wire is the right gauge aand connected right

if you had the speaker wires shorted for a while and boosted your audio waioting for a sound then your audio power amp must be busted. If this model comes with a protection fuse, then it usually blows the fuse and just replace it otherwise if it's a type that doesn't use then only reason why no sound is busted power output amp.

i just had the same thing happen to me what did you do to fix it?