[TrollSelektor]

I have a problem with my amplifier. I bought this here (http://www.amazon.com/Pyle-PTAU45-Stereo-Amplifier-Inputs/dp/B003OELGGG/ref=cm_cr_pr_product_top) to power my subwoofer and it was working wonderfully. Except the 2nd time I started the entire system up it refuses to work. Without any inputs connected it will play a scratchy throaty (almost grinding) sound and the display makes it look like it is trying to output max power regardless of the volume settings. If there is an input it is the same scratchy noises with the audio I am trying to play being faintly heard behind it. I checked the fuse and it is fine. Not sure what the issue is. Any suggestions?