My cd-rom (by 4 users)

Hi, You should be able to get a paper clip, preferably one of the bigger ones and open it out so you have a straight section of wire, then at the fron of the CD drive you will find a very small hole. Carefully slip the wire into the hole as far as it will go then you will need to push against the manual release with reasonable pressure and the door will come open. Remove your disk and close the door and restart the machine. It may be that the disc became stuck for some reason and froze the drive. Once the offending disc is removed it will hopefully come back online.
If it doesn't come back then the CD drive may have failed, fortunately they are not too expensive to replace anymore.