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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

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  • Are you sure the Mac hasn’t booted? Get the IP and try to ping or remote connect to it from another machine when it’s exhibiting the symptoms described
    – Allan
    Commented Dec 20, 2022 at 2:41
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    The Mini spec says "Support for up to two displays at 2560 by 1600 pixels, both at millions of colors". No mention of 3440, so I am somewhat surprised it works at any time.
    – Gilby
    Commented Dec 20, 2022 at 3:58
  • @Allan yes sure. I have Anydesk loaded but i can't remote in. As soon as I power off the display and boot I can remote in.
    – kevllar
    Commented Dec 20, 2022 at 12:31
  • @Gilby yes I'm kinda pushing the limits. The DP port has enough juice for 1440 but only 50hz. Won't work with HDMI. I'm gonna try another cable. Apparently I need an ACTIVE miniDP to HDMI converter cable. I'll report back once I have it installed.
    – kevllar
    Commented Dec 20, 2022 at 12:34

1 Answer 1

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[SOLVED] The new cable worked! If anybody runs into this issue I'm using an Active Mini Displayport to HDMI Cable on a Mac Mini 2012. I'm getting 3440 x 1440 at 50hz and I can totally reboot without any issues during the boot sequence. Do not use HDMI->HDMI or mDP->DP.

Cable looks like this

enter image description here

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