If the power light on this 1200.1 polk amp turns

Lots of help in the links

Amp goes into protection mode - Polk Audio Forum

https://forum.polkaudio.com > discussion > amp-goes-i...
Nov 26, 2018 - As the title says , my 4 channel amp goes into protection mode when I turn my volume up to about 18-20 , causing a loss of sound .
Solution to my Protect Mode Problem - Polk Audio Forum
Feb 15, 2010
Speakers causing the Power Amplifier to go into protection ...
May 9, 2016
PA D4000.4 starts up in protect mode? - Polk Audio Forum
Aug 22, 2012
PA880 Help Needed - Protection Light - Polk Audio Forum
Apr 3, 2013
More results from forum.polkaudio.com

Protection Light ' Polk Audio PA660.4 Support - HelpOwl.com

https://www.helpowl.com > PA6604 > Troubleshooting
Jul 31, 2017 - Polk Audio PA660.4 - How do I turn off or get out of protection so I ca.

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  What To Do If The Pertection Light Stays On ' Polk Audio ...

  https://www.helpowl.com > Troubleshooting > pertectio...
  May 29, 2017 - If your stereo has the protection light on, that means it has detected a short via the speaker connection, or has received over or under ...

Car amplifier(Polk Audio PA660) question - Badcaps Forums

https://www.badcaps.net > forum > showthread
Dec 19, 2013 - The amp, is a Polk Audio PA660. It was entering in protection mode. I have found a pair of final transistors shorted at one of the ...

Amplifier Protection Mode Troubleshooting - Car Audio Help

http://www.caraudiohelp.com > newsletter > amp_prote...
One of the more confusing car stereo problems can be when an amplifier goes into protection mode. One minute it's working and the next minute it's not, ...

You will have to remove the plate amp and look on the pcb, it is generally located near where the main power lines come in.
If you still can' find it contact Polk tech support, Ive owned several Polk products and always found there tech support very helpful; very helpful;
Tech/Product Support
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1-800-377-POLK (7655) Option 1
FAX: (410) 764-5470
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Many of these SUB amps ended up with Capacitor failures in the Power supply section . Find someone who works on amps or TVs to have a look see.

Power off the sub. Push the reset then power back on.

call parts express tell them your problem and they do have a plate amplifier that will work actually it's a better amp with more power.

desktops now a days have more than one plug for the speakers. try playing some music and play which hole works.

if there is a 5.1 or surround on the desktop then most likely the light green jack isnt stereo out but rather unamplified signal. thus when you plug head phones into it the internal amp drives the headphones, but wants the computer to drive the speakers.

try plugging it into the black one... or play pick a hole till it works.

Could be the power supply but the transformer may
have opened up due to a "surge". Might have to contact Polk to see whats up and/or dealer as the
amp may need sent in for repair!

this may be a dumb question but have you turned up the signal. there should be a dial on the back that you can turn the power up. power light on, signal passing threw, the only other thing it can be is the built in amp itself may be dead.

yes you need to go on polk web site and download the driver and you need to get a power cord

this is in response to the post below:

I just bot a basslink t and i wired it up and nothing it just keeps blowing the fues in the unit i got mine on ebay so i dont know if i can use the warranty dose anybody have an ida for me- britter623

I got a used basslink about a month ago and had the exact same prob kept blowing fuses...found out that the voice coil had blown on the infinity...so I had a brand new dvc polk 10 sittin in the closet, I swapped them out, put the polk in the place of the infinity sub, however, the magnet is much larger, hence, dual voice coil, it would rattle sooo much from the passive radiator against the magnet, also could not turn the gain up at all due to the rattle. I got the bright idea to build a "custom fiberglas enclosure for the polk and incorporate the infinity's parts(amp/control) I finished the box finally last night and hooked it up this morning, no power, no lights, no nothing! s@#%, F&@%! ANyone had a prob w/the amp not having the lights turn on, no power??? Hope that helps about your fuse blowing issue.