Amp stopped working...

Question

Yesterday I was driving home and had my stereo on. The volume was on a low setting and all of the sudden the bass just went out. So when I got home I checked the amp and the LED light wasn't on. I replaced both of the 30 amp fuses twice and still nothing. The 80 amp fuse on the power wire doesn't look blown but I will replace it anyway. I read the troubleshooting guide in the manual and it was not any help. I also looked around at different sites and they said to check for pinched wires or wires that may have become grounded, but I haven't moved anything since it has been hooked up. I tried everything I could and can't find the problem.