HT202856 Mac Pro with Samsung UHD 4K TV

I find it difficult to use a Samsung UHD TV 6950 as the monitor for my Mac Pro. When I start it at times the Apple start up disk begins, but then the follow up line does not appear and the screen is black. Any help would be appreciated.

What is the resolution of the TV?
How is it connected?
What model Mac and OSX version?
What do yo mean by "Apple start up disk begins"? D yo mean yoe see a progress bar proceed and then the screen goes black?
Is is a startup from a normal shutdown?
Can yo start in Safe Mode?
OS X: What is Safe Boot, Safe Mode?
Can you start in Recovery and repair the startup disk?
OS X: About OS X Recovery - Apple Support

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