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Personally as a Moder, Remove the Umd, put CFW and download Games and play them much quicker ( Notice: You buy the games before you Download them )
IDk Ur problem because I am not there but, did you Spill something and If you did short it I doubt thats what will happen.. Maybe the ribbon connector Isn't in properly, trust me check it out. The casing or shorting shouldn't really effect the Umd Drive. Just study your psp Carefully and that should tell you. Sorry if I am not helping
But Seriously Check ,, some thing could have fell, into it, Shake your psp to check.This Might Fix the issue: Move the laser to the other side and test it.
you pay shipping ill send you a fat umd drive.