I have a Pioneer A-35R amplifier connected to 2 5' long JBL speakers.  I have a Sony Vizio TV that only plugs into the Pioneer with the headphone jack - there are a ton of different inputs but no RCA output on the newer TVs.

So, I am going from 1/8" headphone to dual RCA into the "CD" input on the amplifier.  It worked great! Until...

I unplugged the cord to use it on something else, plugged it back in a few days later (today), and turned everything on.

When I turn up the volume, the sound goes POP and all the lights (CD, Phono, Tuner, etc. toggle lights) are blinking, then it goes silent and freezes so I have to shut it off and try it again.

I turn it back on, and the sound is very faint, sometimes I get a 60-cycle hum with the TV sound very faintly underneath.

I shut it off and turn it back on again, and it goes POP and all the lights are blinking again.

Did I blow it by putting something in the wrong place?  How do I fix it - quickly!?  It's not my unit and I can't afford a new one, but I do know how to take something apart and solder it back together. 

Please help!!!