My macbook wont boot up, black screen and the cd drive keeps making a constant sound. What to do?

My macbook wont boot up. When I turn it on, the screen turns black right away and the cd/dvd drive keeps making a constant "ejecting" sound.
The strange thing though is that once in a while starts up propperly, but suddely goes black again (after a min. or two), and the ejecting sound comes back. What to do, and yh, I've never done a back up so would it be possible to take out the HD and regain whats in there?
Any help would be appriciated!

Hello. Try resetting the PRAM and SMC first.
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379

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