Having worked as a PC technician I have found out that some computer parts are considered consumables. That is because their very low price compared to the cost and time to repair them makes them not worth repairing.
You'd be better off getting a new CD drive or even better a DVD-R drive (with the low price that you can get one), which will after all help you with all your reading and writing needs.
If you just want to get the system working then I'm with The_Bezerker; just buy a new one. The prices are so low these days that these are a commodity item.
If however you want to stretch your brain, learn something new and replace the glass in your window (as you'll probably end up throwing the drive through it) then have a look at
. If the drive doesn't work you have nothing to lose except lots of time and you might learn a great deal in the process
Go buy a new one, like everyone else said. You could spend hours/day/weeks trying to solve the problem and fail. Then you will end up buying a replacement anyway!! So save yourself the heartache, and buy a new one.