Hi. I bought a new computer about 2 weeks ago. I purchased a Lite-On 18x DVD-RW drive. It worked for about 2 weeks. Then my sister came and put a cd into the drive while the computer was in sleep mode. After that it never worked again. If I go into my computer it doesn't say there is a drive. What could be the problem? We went to get another drive, connected it but it has the same problem. Any idea?