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Second screen "suddently" stopped working

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Hi together,


I am currently running my hackintosh on a Z84 with an i5 and a Intel HD4600.
The version running is 10.9.5, the niresh version.


My boot settings:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<key>Kernel Flags</key>
<string>-v npci=0x2000 dart=0</string>


Everything worked fine for a few weeks now with 2 screens (1 x DVI, 1 x HDMI) but today the second screen stopped working.


The HDMI screen is not working.


The screen isn't broken because I can see both screens while the bootloader is running.

I have absolutely no idea where I could even start to look for the problem.

Thank you for your help :)

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