I sold a jl 500/1 that I had used for 5 month previous and it was in perfect working order. now I sold it to someone about a month ago and he's come back to me saying its not working. I took a look at it and everything seemed fine. The green light is indicating it's getting power. I put it on a better ground for the guy and it was sounding great. (it's powering a 12w7) but now aparently the green light went out and the amp isn't working at all. Has anyone had any issues with these amps? I checked all the connections and they seem to be alright. Im just finding it hard to believe its the amp that's having the problem since like I said it was working perfectly for me.