Well my birthday was pretty good today up until now. I just pluged in my bass and tried to turn my amp on.... well..... when it powered up, all the lights started flickering and some weird crackling sounds came from my head. Now it won't power up at all. What do you think may be wrong with my Ampeg SVT 4 Pro? It's probably 2-3 years old, but I've totally babied it and never had any problems with it.