If your Cd-rom won't open not even 1 cd then you have a hardware problem, either your Cd-Rom drive has failed or your Cd-Rom lens are dirty and can't read until they are cleaned. To clean the lens or repare the drive we advice you to go to a service.

CD ROM stands for Compact Disk Read-Only Memory. CD ROMs store and read massive amounts of information on a removable disk platter or solid state storage chip. Unlike the data on hard drives and diskettes, data on CD ROMs can only be read--not altered--by the user. Also called 'firmware.'