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If I had to guess, a power supply wire was in contact with the amp chassis from the amp sliding around. Then when you tried to put the screw in, it completed the circuit and you blew a fuse. It could be either your remote lead or your power supply- check both, as well as any internal fusing the amp may have. If none of your fuses are toast, check each lead with a voltage meter and see which is the culprit. If both are returning 12V, check your ground. A bad ground wouldn't cause the sparking you're desribing, unless it got looped back around and touched the amp chassis. If all of that is in order, I've got some bad news.... Smell the amp- blown amps are easily diagnosed by their unmistakable odor. If the amp still smells good, take the amp into a shop and have it benched. Other than that, I'm out of ideas.
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