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On every startup I see the message that my computer was restarted because of a problem. System uptime in the log is always the same, so I guess it's a faulty error that's stored somewhere. I read other threads with similar problems, but deleting nvram.plist didn't help and sudo nvram -c...

I updated to High Sierra two weeks ago and am facing a boot issue since then. - If I start the machine after complete shut down, it hangs on the grey logo screen and I have to power it off with the on/off button - After hanging at the grey logo screen 2 times, it successfully boots on the third...

I am running completely fine with my setup using a DVI cable to connect the onboard graphics with my monitor. Now I wanted to try the HDMI out with a HDMI-DVI cable I found at home and it worked, too. (wanted to check if I'm ready for using a 4K display over HDMI). But now I have a strange...