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Black Screen on Boot / Garbled Screen Yosemite

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Joined
Jul 23, 2012
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265
Motherboard
TUF Z370-PLUS GAMING
CPU
i5-9600K
Graphics
Vega 56
Mac
  1. MacBook
  2. MacBook Air
Mobile Phone
  1. iOS
Hi All

My system has 100% functionality and I'm very pleased with it.

However, I seem to be facing the same problem a lot of other seem to be facing but no one can put their finger on it.

When I boot up, I get the white screen with the grey apple logo. Perfect.

But when the progress bar gets about a third of the way up, the screen turns black and the progress bar almost becomes a grid.

I have a 'Real' Mac, and I don't get the same smooth transition as a 'Real' Mac as boot get to the desktop.

Has any one figured this out? My first thought was the refresh rate of my monitor. Admittedly, I'm using a Samsung 40" TV with a 50Hz refresh rate.

Thanks all.
 
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