if i recall correctly, the warranty requires prior registration, which few people do, and even so if the person did register it, you don't qualify because you are not the person who made the registration. there are ways to open the system but it requires that you break the warranty and thats teh only way. if they was some other way, sony would have done something about it. if you really want to take it apart, there is this book that shows you how
http://search.barnesandnoble.com/boo...sbn=0471778877
it has detailed instructions on how to take it apart and other random stuff for people new to the psp... i have the book cuz it went on sale for 9.99 yesterday... something maybe people who look at this site and get lost should read... most of the stuff is outdated compared to this site tho so yea...
just dry it up carefully then get an ac adaptor for it... those things range around 9.99.. or borrow one or something and test it out... cuz sony ain't taking it back