Waking After sleep
When the laptop is left for some time, it sleeps ( the screen goes blank). When I press the mouse the password screen appears. Till recently, I was able to type the password and wake the machine.
Now, when I type any key it just makes a beep sound and no key appears in the edit box for the password. If I press the ESCAPE key, then stars appear in the edit box. But, do anything, the characters don't appear. Then I keep the power button pressed for some time. Switch off the machine. Start the machine again.
Any help?
MacBook Air, OS X Mountain Lion (10.8.2)