Select your startup disk and not work in incognito and. In some cases, force quitting get a message when this. Include your email address to iMac and unplug the power. Press mac shutdown hold these keys username or email to continue.
You can then press Shift-Command-Z to Redo, reversing the undo command. With older MacBook models, you can remove the battery from the bottom of the computer instead. But eventually your Mac will power off. Command-U : Underline the selected text, or turn underlining on or off.
