My CD drive is being erratic

[The Czech Republic]

So here's my problem. The CD drive in this computer seems to randomly decide whether or not it'll read a disc. After a few ejectings and putbackinnings, eventually it'll play the music. But I can't always depend on it to work. I don't think it ever has anything to do with the CD in question...it does this on everything. What could be the problem? Any ideas?