My sounds cuts off and then my green power light

My sounds cuts off and then my green power light starts to blink

This sounds like you are having a problem with the ground wire. When the amp is not properly grounding the amp will loose power the light will flicker and your speakers will stop working.

Make sure the ground wire for the amp (the black wire) is grounded correctly. The end of the wire or connector should be firmly grounded under a nut for example.