You need to somehow get into
Finder. Perhaps click at one of the screen edges (a few seconds of moving the pointer there will do), or use an application launcher (e.g. Quicksilver, LaunchBar). If you never disabled the keyboard shortcuts, press
Ctrl-F3 once to get Dock keyboard focus, then
Cmd-N to open a new window
Cmd-Shift-C to get to top (machine) level
Esc, then type Volume Name once to get the desired entry
Cmd-E for Eject
If you have mounted disk images on external volumes, this might not work at all, they block ejecting.
If you don't know the volume name, replace steps 3 and 4 with:
Down once to select the first list item.
Cmd-E for Eject
- Select another list item by pressing
Esc (clearing selection), then
Down once or more.
- Repeat these steps a few times to unmount all volumes except the ones you cannot (i.e. Network item and your start volume)
Alternatively, find out your exact
umount command and start
Terminal using an application launcher, or by finding Finder like above, then pressing
Cmd-Shift-U to open the
Utilities folder, then type Terminal to locate the program, then
Cmd-Down to start it.
If you have a launcher such as
Launchbar, type your hotkey then "shutdown". Press enter and see if the machine gets turned off.
Close the lid to go to sleep. Not a dismount, but there shouldn't be any more disk activity.
Click the very top left of the screen to open the
Apple menu (move the pointer for a few seconds there), or, if you didn't disable the keyboard shortcut, press
Enter to focus the menu bar, then open the Apple menu. Press
Up twice, and then
Option+Enter. This will shut down the machine.