HT201177: Get help with video issues on external displays connected to your Mac

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tlc277

Q: Display screen flickers going dark

The display screen pulses going dark.  I've shut it down and rebooted to no avail

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VIN,iMac (21.5-inch Late 2009)

Posted on Aug 1, 2016 6:16 AM

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Q: Display screen flickers going dark

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