My MacAir 1st gen. won't boot after latest OS X Lion update.

My MacAir 1st gen. won't boot after latest OS X Lion update. tried safe boot(didn't work) tried disk repair, said it was successful, but my mac won't start up. Just get white screen.  Also been having trouble with it overheating. Fan seems to work. But when it get too hot whole interface slows down.

Yikes, I hope you have AppleCare on it still, I think it needs to be taken in, but as a last ditch effort...
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.

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