My Macbook suffered water damage some time ago but was repaired. All was working fine for about 3 weeks when the screen began to only show up blank and white. Now everything starts up fine and the computer is running but only showing white screen. Any ideas??
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Connect to an external monitor... if it looks normal your GPU is good. If it does not you have a GPU/logic board problem.
Sometimes white screens are caused by corrupt boot volumes. Try to boot from a Repair disk or partition. Try a Safe (shif) boot.
If either of those work you probably need a clean install of the OS.
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