Amp powers on, LED light is green, NO sound from the sub?! can anyone help

[mmmoneta]

figured it out guys. they unhooked the RCA cables and while messing with the cords i must have pulled out the negative wire on my sub so once that was reconnected my car started rattling again //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

thanks guys.