Connecting external display turns both screens black

Question

I updated from 10.8.1 to 10.8.2 for my MacBook Pro Retina with my external 27" Thunderbolt display. When I connect to my Thunderbolt display both screens are black. I can only see my mouse pointer and sometimes little boxes of display. Any idea what's wrong?

score 2 · Answer 1 · edited Sep 14 '13 at 12:15

2

The solution explained in this Apple Discussions thread worked for me.

Delete /Library/Preferences/com.apple.windowserver.plist.
Delete ~/Library/Preferences/ByHost/com.apple.windowserver.XXXXX.plist.
Reset NVRAM.

edited Sep 14 '13 at 12:15

grg

201,078

answered Dec 07 '12 at 12:13

Prasath Nadarajah

51

Connecting external display turns both screens black

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