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Hi Apple experts...
Occasionally since upgrading to Yosemite. When I wake my air from sleep I get the following screen. Only by holding the power button and closing it down can I get it back up and running. Any ideas, as this has never happened before I upgraded
MacBook Air, Mac OS X (10.7.4)
I have the same problem.
You should be able to enter you password and press ENTER anyway
white screen after wakeup since upgrading
