My laptop keeps shutting down at start up?

I'm not sure what you might've done, but it was stupid to blow into your fan (are you sure it still works?). It seems like the only thing you have left to do is to wipe and restore your system from the installation disc. You can backup your files through the install disk. If you need help on how to do this go to gabessdsp.webs.com and make a forum post about it, somebody there can help you, they can even do a system restore for a very low fee/free if you pay the shipping charges. But that seems like the only way to go.