What to do if screen is totally black with curser showing?

This morning after having Mac Pro in sleep mode I went to use computer and screen is totally blank with curser showing. I turned computer off and the screen appeared white with the apple logo but once it was on screen went black again. Can someone give me some direction on what is wrong.?

Do you have TimeMachine or Clone backup?
If so,try Reinstall OS X first.
Reinstall OS X
http://support.apple.com/kb/PH13871
If that does not help,  erase and install OS X.
Erase and install OS X.
http://support.apple.com/kb/PH14243

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