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Mac Pro (Late 2013) Pink Startup Screen Since macOS Sierra Update

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Hello!

I have a Late 2013 nMP bought in early 2014 which originally came with OS X 10.9 Mavericks but was upgraded to OS X 10.10 Yosemite.

I've recently upgraded to macOS Sierra and am experiencing some strange behaviour on startup where the screen has turned bright purple until I get to the login screen where it goes back to normal.

The nMP is connected via HDMI to HDMI to an Asus 27" 1080p external monitor. I have tried PRAM and SMC resets using different cables, ports, monitors and...

Mac Pro (Late 2013) Pink Startup Screen Since macOS Sierra Update

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