Since you haven't given us much information about the computer, it's age, etc., it sounds like the drive has gone south. If it was working before, you haven't done anything recently to change the configuration, then a new one is cheap and easy to replace.
Whenever posting questions on these forums, please give us as much information as possible about your computer. Depending on your issue, we might need the operating system, processor speed, amount of RAM installed, brand name of the computer, (if there is one), and any EXACT error messages you are receiving. The more information you give us, the better informed our answer will be.
Hope this helps.
CD ROM just went away. Device not ready, or folder does not exist, or insert cd. Door opens & closes, all conectors in place. When you do a new device search it does not find it.