did u check the fuse coming off the battery? it may not be blown, but it may be warped. This happened to me in my 4th gen civic. On a Friday the 13th(of course ) I was driving home from work and had my beat going strong. After about 5 minutes of beating out, everything became staticky, until I turned the volume all the way down to a whisper, anything louder than that and it was pure staticky as hell. I could not figure out the prob for the life of me. I though I had blown my pre outs cause my deck only had a single set of 2 volt preouts and I was running 2 amps off the single set. After ripping my deck out, bench testing it, hooking it back up, still having the same problem, exchanging it and upgrading to a better deck(w/2 sets of preouts ) and still having the same problem. I said f*ck it, I know the fuse isn't blown cause my amps are powered up, but what the hell, let me check the damn fuse anyways. I looked at it and it looked like a Ruffles potato chip(hella wavy) still intact, but wavy. I put a new fuse in it and problem solved. I was mad that I didn't get that done in the first place, but I ended up getting a better deck(thanks Best Buy:thumbup: ) out of it so I just had a bruised ego for a minute.

Cliff Notes: check ur fuse coming off the battery and replace it if it's not flat like it's supposed to be