If you didn't hack it, and it's relatively new, try sending it into Sony for repair. If its no longer under warranty then I would try to find a local repair shop. (Mom and Pop style game stores. Yeah, I know they're rare, but if you're one of the lucky ones to have one, ask them about it.)
If you hacked it, and you have a pandora battery, I would reload OFW, and try the above options. Then just rehack it when you get it back.
That's all I got. Sorry if it doesn't help.