I had a problem when i first got my laptop, it would read dvd's but it wouldn't read data or music. Come to find out the laser that reads data and music was bad on it, but the dvd one was just fine. So if you can't get a result off of cleaning it..you might be SOL and have to buy a new drive
1) Make sure u have the right jumper settings
2) Make sure bios reads ur cdrw drive
3) Make sure u have the right ribbon cable
4) Make sure that the ribbon cable is plugged into the motherboard...
5) Clean your cdrw drive
And if that doesn't work... I don't know what will