Something similar happened to me during one of my many trips from school to home. What happened to me was that I actually ended up frying my motherboard because of some error I made while putting it together, so I'd take a peek at the inside and make sure everything's okay. If that's the case, you're better off with a generic motherboard because the Sony motherboard I'd have had to replace my old one with was about $600.
But I'm not exactly an expert, just speaking from experience. I'd take Tigershard's suggestion and look that link up.
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