Amp caught on fire

I moved my ground to a different bolt in the same area and i was listening to my stereo and it stopped. I checked and it was the fuse on the amp. so, i replaced and the next thing i know pop, fizz, flames, and smoke. not just sparks I mean the damn thing was on fire. Can anyone tell me what the hell might have happened. I can't see why moving the ground wire would do this, but maybe one of you can. If not the ground what else could have happened. The amp was only two weeks old. I really don't want to go through too many amps or even worse torch my truck.

did you fuse the power wire at the battery??    did you put a bigger fuse in your amp then what it had in it?  did you buy cheap equipment ?2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

What kind of an amp you got ?,are the pos and neg power wires thick enough,what gauge are you using,sorry about all this questions but we would like to help you,and yes like jeffchilcott said you do have a higher value fuse near the battery ?,do you have any other amps besides the one that fried ,maybe your fuse (main) just wasn't right,check them out and let us know,good luck !Dan M C