I have a Vyper 15w modeling amp, the input jack keep's coming loose how do I fix this? Also what damage can it cause to my amp?
it shall cause you to buy a better amp.
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if it rattles around real fast (6000 mph) it could rip the amp apart. >.>

take it to a tech, or open up the amp but be careful not to touch anything. ask your dad/grandpa/uncle if they have a discharge stick, use that to touch the capacitors and resistors (to discharge what current is stored in the capacitors). Then screw the input jack back on.
Be careful if you're doing it, i still advise you to take it to a tech but eh.