After upgrading latest version of Operating System on my 2013 Mac Pro I cannot get an image on my monitor unless I connect another monitor (Samsung). Once I sing in using the Samsung monitor I get the same image on my BenQ monitor. Do I need to upgrade the driver for my BenQ? If so where do I find that? All I see is for Windows Operating Systems.
If it used to work and now doesn’t after the OS upgrade then I would check for a patch from Apple. Besides reverting back to the old OS version you might need to wait on apple or check apple forums for a work around.
Our monitors use the generic PnP drivers provided by the OS.
If we come across a patch from apple we can email you a link.