motors rarelllly go bad. I've working on a lot of 90s CD consoles and never seen one die myself. I hear it happens to other people though.
Sounds like your laser is biting the dust, very common, especially at this age. I would look for a replacement.
You can see if the laser moves up and down when you push in the lid sensor switch. How they work is they first do that to see if there is a disc, then they spin and seek for the first track.
If you are really desperate there is a potentiometer you can adjust on the laser usually. But it's a long shot. Only do that if you are sure the laser is going muerte.
-Segasonicfan