Drives are not mounting to desktop on macbook pro.

External USB drives, SD cards and even DVD media is not mounting to desktop when connected.
This is a new problem for me and have not had this issue previously. I have successfully connected the same devices in the past.
They all show up in the disc utility as connected. I am unable to mount them from disc utility (this button is disabled) and they are not showing up in Finder either.
Please help!

Hi Paul,
Sorry for the late answer. I live in Europe, so that's why I was asleep ;-)
Basically the command tells your computer to unhide everything on your Desktop, so if you don't have a Desktop, something is definitely wrong.
My guess is that there's something wrong with your account on that computer. You can check that by creating a new account in System Preferences (click on Accounts, click the lock in the bottom-left corner and then click the "+" button just above).
Then try mounting "some" media and see if it appears on the new user's Desktop. If not, I would highly recommend to reinstall Mac OS X.
HTH,
Jasper.

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