Give more details. Machine, OS etc. Do you have restore media or backups?
I tried to reboot it several times with no luck. It started when
I tried to replace my cd/dvd drive. My drive dosen't show up on my computer. I tried to replace the drive and the computer won't even boot up. All I get is a black screen and it tells me to press certain keys. When I do it just sits there.
Is there anything else I can try.