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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.

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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 at 18:28

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