What's wrong with it?
Most likely, it'll just need a new screen. Is it an original Gameboy brick? If so, it would be pretty cool to try and retrofit a GBP screen into it.
So what I'm late big woop wanna fightaboudit? Well the screens on a couple of my gb's are starting to crap out with these little "ink blotches" small but annoying (yes I still play them). I heard about swapping a gb pocket screen before but all my pockets work so I'm not willing to sacrifice one. Any idea of where to find one?? I'm sure it'll look great back lit.
(+points if you get the reference)
I thought it was Fry's boss at the pizza shop ("I read about in big whoop magazine!"), but I'm guessing family guy?
eBay eBay eBay.
Search = gameboy broken
That's pretty much my number one search as of late. I hate to think that I'm telling you guys this and possibly ending up bidding against some of you, but honestly I've purchased 5 GBAs, 4 SPs, 2 NGPCs, 2 GBCs, 3 3DSs, a Pocketstation, and a Swan Crystal in the past month. I think indeed to take a portable console break anyway

Of the 7 "broken" portables I've purchased in the last month, only one was indeed broken (an SP that was ripped in half). The rest either worked just fine right out of the box or just needed a little cleaning. There's no moving parts on these things, and about the only thing that really breaks on them seems to be the speakers, which doesn't even matter if you're only planning on swapping the screen.
Good luck!