![]() By performing a clean install, we eliminate any potential software issues, not factoring in bad display driver code (typically these drivers get updated when you run system updates or upgrade macOS). Update the software on Mac: Īt the end of the day, the issue you are having is either software or hardware related. I was having issues using display port and external monitors, updating to High Sierra resolved the issue for me. You can try updating to the latest macOS. You can also perform a clean install from macOS by reformatting the storage drive before installing the macOS. In recovery mode, if you choose to reinstall the macOS it will preserve the files on your system. If hardware diagnostics passes, you can use Recovery Mode to reinstall the operating system or erase the machine and do a clean install. Note the Apple Store Genius Bar can run deeper tests on your machine if you schedule an appointment. Even if you machine passes the diagnostics, you may still have a hardware issue. Restart machine and hold the "D" key till prompted to run diagnostics. Run diagnostics on your device locally and check for potential hardware issues. ![]() Restart machine and hold down the shift key till you see login screen. Try booting in Safe Mode as suggested and see if you can reproduce the issue. On Mac computers that play a startup sound, you can release the keys after the second startup sound. You can release the keys after about 20 seconds, during which your Mac might appear to restart. Try reseting NVRAM: Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Hold these keys and the power button for 10 seconds. Press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Make sure you backup all your files first before continuing troubleshooting: įollow this support article from Apple regarding video issues using external displays: I understand you have tried a lot of troubleshooting in the comments but I listed the steps that I would follow below. If the issue occurred after an update you may have a potential software issue. There is no corrupted graphics like in the other question(s)Įdit 2: The main monitor is: LG 27UD88-W Monitor 27" UHD 4K USB-C USB 3.0, connected via DisplayPortĮdit 3: The problem also happens when I unplug the monitor (or switch the monitor, in its own menu, to use another input cable)Įdit 5: Also uninstalled SwitchResX (via their menu). As described in: 1280x720 HiDPI resolution for 2560x1440 monitor I was fiddling with SwitchResX for custom display modes (HiDPI on external displays). I do not see anything interesting in Console logs (although maybe someone could point me to where to look). ![]() There is no error message, like "was not closed normally", therefore I believe this is not a duplicate of After Installing El Capitan I Will be Logged Out Frequently (and mine is about Sierra). I don't recall this happening on El Capitan. It's not just "show login window", because all apps load anew after logging in (which takes a very loooong time, killing my productivity). When plugging a second external monitor, macOS Sierra "logs out" (crashes?) user session.
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