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Jul 26, 2015 6:35 AM in response to CharlieYouby mario49,Hello CharlieYou,
After reviewing your post, it sounds like the video has trouble when you are watching a youtube video on Safari. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
It may be software related, see if the issue persists in Safe Mode.
Try safe mode if your Mac doesn't finish starting up - Apple Support
Thanks for using Apple Support Communities.
Have a nice day
