purple bootscreen on Mac Pro (Late2013)

Question

Patrick-E Author

Level 1

8 points

purple bootscreen on Mac Pro (Late2013)

Hello,

i have on my Mac Pro (Late 2013) a purple bootscreen.

(10.12.2 , FileVault is activ)

i try 2 different displays and 2 different HDMI Cable ... but it is the same.

If i enter my Passcode (screen ist purple), and the loading bar comes up, it come a litte black screen and after them my Display show the right color and i can work fine (see last picture).

What is wrong ?

How can i fix it ?

Mac Pro, macOS Sierra (10.12.2), Mac Pro (Ende 2013)

Posted on Jan 12, 2017 11:37 AM

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Answer 1

DonH49

Level 6

16,710 points

Jan 12, 2017 2:14 PM in response to Patrick-E

Don't really know but what I would try would be a pram zap and an SMC reset.

Here's how to reset your PRAM:

Shut down your machine. Yes, all the way down, not sleep or logging out.
Press the power button and then press command-option-p-r. ...
Hold those keys down until your Mac reboots again and you here the startup chime.
Let go of the keys and let your Mac reboot normally.

SMC reset: shut down Mac. unplug everything from Mac, that means power to Mac also. Wait a minute then plug everything back and power on.

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Answer 2

DonH49

Level 6

16,710 points

Jan 24, 2017 5:52 PM in response to Patrick-E

On each display make sure you go into the display menu and pick the proper input type. HDMI 1.4 is highest you are going. Also if those displays have display port then remove the HDMI and try mini display port to display port cable v1.2 to be exact. This permits 60 hz Also set the display input for display port.

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