CD rom drive not spinning freely

That is clearly an hardware problem. Only easy operation you can do to try fixing it is cleaning the lens, sometimes dirty lens can give you similar problems. second solution is disassembling the combo drive to identify mechanical problems and assembling it back. Third step to do is checking the electronics (controlled board, heads, motor, etc), but probably at this point will be more convenient to find a second hand combo from ebay. They shouldn't came too expensive.

cheers