i have connected my dvd rom but it is not showing on my computer .
More aboutshowing computer
What OS are you running? Do you have it set to hide when empty (win vista/win7)? Is it an older PATA DVD drive which needs to be set to master/slave/cable select? Will the tray open and close when the button is pressed?
Does this drive show in BIOS and Disk Management (Right click on computer >> Manage >> Disk Management.