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Aug 5, 2015 7:40 AM in response to Moutaz1981by jason269,Hi, Moutaz1981.
Thank you for visiting Apple Support Communities.
I understand that you are experiencing an issue with video using HDMI. I would start with an SMC and PRAM reset as outlined in the two articles directly below. Make sure to test the results after processing each step.
Resetting the System Management Controller (SMC) on your Mac
OS X Yosemite: Reset your computer’s PRAM
If the issue persist, try using a different HDMI cable and take a look at some of the solutions in the article below.
Mac computers: Frequently asked questions about using HDMI
Cheers
