Or, perhaps the subject heading should be phrased t'other way around: "Completely disappeared DVD/CD ROM derive isn't functioning". Reason for the either/or is because I've no idea which came first; the disappearance from Windows Explorer of the drive, or the fact that nothing now happens when I press the button on the computer case to open the disk tray.
The first time I realised there was a problem was when the tray refused to open despite repeated button pressings. Then when I happened to check Windows Explorer I saw only Computer/ Drive C/ Drive E, where C is my internal SSD for the Windows 7 OS and programs, and E is the 'My Documents' drive for everything else.
No sign of Drive D -- the drive letter that used to be there for the CD/DVD drive.
I've looked in Device Manager and there's no mention there of any DVD/CD ROM drive either.
It. Has. Vanished.
And because it's not showing at all in Windows, I'm stumped as to how to get it to actually start working again. (I've re-checked, usingSystem info, from Windows 7 forum. It shows only two hard disks: the Crucial SSD and the Western Digital E Drive.)