Kind of an edge case, so not sure if anyone can help with this. I purchased a new LG 34WP88C for my aging Mac Mini 2012 (6,2) hoping it could drive the display and it does, brilliantly, at 3440 x 1440 but only at 50hz. I'm totally happy with this setup BUT... I just discovered that my Mac Mini now cannot boot with the monitor connected. If I power down the display and restart my Mac. It boots up normally. I just need to turn on the display after it restarts. If I reboot with the display powered on then it says No Signal and the Mac refuses to boot up. I can't wake it up or toggle the display on and off. I have to do a forced shutdown with the power button on the mini. Monitor is connected with Mini DP to DP. HDMI works but won't allow me to achieve the same resolution.
Ok looks like this only happens during a reboot. Shutting down completely allowed it to start to normally with the monitor powered on.
Please any insight or workarounds or fixes for this issue.
Macos Catalina 10.15.7 2.6 GHz Quad Core 16GB RAM