Windows

If it just stopped working u might wanne check your IDE cabel for being plugged in proparly. Else plug in an different (working) cd-rom player and check if this fixes the problem.
( might wanne check your bios if it sees/enables it )

Hi vrajan18

As well as checking the IDE cable is properly secured at both ends, you should also make sure the power cable is properly connected as well. Does your CD drive light up when you power on your system? Can you eject the drive? If you can do these then it may be a case of reinstalling your CD drivers.

Go to your CD drive manufacturer's website and download and then install the latest drivers for your OS. If this does not work, then open device manager and remove the CD drive. After you reboot, the OS should detect it and automatically reinstall the device. During this process you may want to allow it to install Microsoft's own driver. If it works after that you can then install the new drivers you downloaded.

Good luck

I've heard of a few people who have had problems with CD-ROMs not working after playing copy-protected music cd's, something to do with the new device driver it installs.
try http://www.cs.princeton.edu/~jhalderm/cd3/
to find further information on the drivers and removal on computers.