You probably need a new blue laser diode. You can find them on ebay if you're willing to tackle it yourself. There are youtube instructional videos to guide you. I'm sure you can find a console repair person around you on Craigslist or some such. Last of all you could have Sony fix it out of warranty but I believe that to be around $150 USD.
I have a launch DSLite. Mine suffered from the cracked hinges and I called up Nintendo before Christmas '09 wayyyy out of warranty. The support person I spoke with was fantastic and got the process started by sending me a shipping label via e-mail and actually had it shipped UPS RED back to me free of charge so I'd have it back before Christmas. It came back with the same serial number just a different top half If I'm not mistaken. I have to hand it to Nintendo for this one.