HT201800: Apple Cinema Display: Troubleshooting steps
Learn about Apple Cinema Display: Troubleshooting steps
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Helpful answers
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Sep 21, 2015 8:48 AM in response to marta34by lllaass,Is your Mac one of these:
http://www.apple.com/support/macbookpro-videoissues/
If so then do what the article says.
Otherwise:
- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Also try booting to boot manager (boot with Option key depressed). If yo still see the line that mean yo have a hardware problem
- Make an appointment at the Genius Bar of an Apple store.