USB devices not "popping up" onto desktop

Help! When connecting USB devices to my Mac Book Pro they device does not "pop-up" onto the desktop. It is present in the System Profiler, but I am unable to use the devices - ie. I cannot use my external hard drive for Time Machine? Any suggestions. Thanks heaps.

Try this:
Close all active applications you've launched. When you see the word "Finder" at the left end of the menu bar next to the Apple icon. click it to get this:
Highlight "Preferences..." as shown. When Finder Preferences, open see if any of the check boxes in the upper part of the "General" tab are unchecked:
That example is from Tiger OS 10.4.11. In Snow Leopard, there is an additional checkbox "External drives." Check all the boxes and see if the USB devices show up.

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