On start up sometime only 3/4 of desktop is showing. I restart and everything is fine. Same problem when opening lid, sometimes I get 3/4 screen showing. Any solutions?

3/4 screen of desktop showing at start up and opening lid. How to fix this please. Restart usually shows full screen of desktop.
Ron

Hello mastertaster,
It may help prevent the loss of the lower quarter of your MacBook Air's display should you reset your system's SMC and NVRAM.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Cheers,
Allen

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