My new 13" MacBook Pro rarely recognizes a third-party display. The display works fine with a PC. It is connected via a third-party Thunderbolt/VGA adapter. Worked beautifully the first time. Now I get a "no signal" on the monitor. MacBook partially freezes. Tried rebooting, etc. No luck.

  • Do you happen to be running gfxCardStatus? It's an excellent utility, but there is a long standing known issue when connecting external displays while using "integrated only" mode: github.com/codykrieger/gfxCardStatus/issues/9
    – taranaki
    Apr 6, 2014 at 18:28
  • What OS? What adapter? What's in the console when the Mac freezes?
    – bmike
    Oct 22, 2015 at 16:24


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