Sometimes I have a problem where my Kensington USB keyboard stops responding. The only way to fix this is either to reboot or to unplug and replug in the USB cable. However, keep in mind I'm not using a real Apple Pro Keyboard - it's a Kensington one.
Also, Mac OS X is unix based ... which means that on top of the nice GUI you're really dealing with BSD/Unix where all drives and disks (filesystems) must be mounted and unmounted (to work with them and to eject them). If ejecting the disk through the GUI doesn't work for you, try the "umount" terminal command. Note that all mounted filesystems appear under the /Volumes/ directory. Note you may need to use a Terminal to get there.
Okay, so this is a quick unix lesson ... the Terminal app is accessible by going to the Applications folder and then into Utilities. The "cd" command, just like in DOS, allows you to switch directories. The "ls" command is the Unix equivalent of the DOS "dir" command to list the contents of a directory.
Check out the TechTutorials forum for some more Unix commands
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The Queen of DaniWeb
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