While not a lot can go wrong with the modern CDROM drive. There are a few things to keep in mind.
CDROM drive will not play CD's. With the advent of "burned" CD's, some CDROM drives will not recognise the format information on a burned CD, therefore will not read the information contained on it.
In the case you are trying to access a burned CD copy, try a registered copy, if it works it means that your CDROM drive is unable to recognise burned disks.
If this is not the case check the drivers for your CDROM drive. Then the interior connections
to your CDROM drive before suspecting a faulty unit.
CDROM driver does not play audio CD's. First make sure that your speakers are turned on don't laugh people have paid good money just to be told that they didn't have the speakers on!
First, if you are running Windows 95 or something similar check the CDROM icon to see if the inserted CD is recognised as an audio CD. Check that the LEDs in your CDROM drive are working normally. If the answer to the above is yes, procede with the next step.
If the CDROM drive is not recognising the audio CD or the lights don't seen to be working normally you can open the computer cover and check the conections before calling a technician.
Next. After checking connections and that the CDROM drive LEDs are working properley, make sure that your operating system is setup with the CD player option active. Most operating systems will play the CD automatically and a window or a task message will appear on screen showing the CD player operating.
As mentioned before, some CDROM drives have problems with certain disk formats. The dreaded Bali CD copies, burned disks and American formats to name a few.