Installed and ran Windows 11 up until yesterday. After a recent update and reboot, Win 11 would no longer display on the Monitor. It did make the Microsoft "sound" indicating it had booted to Windows login - just couldn't see it. Additionally there was no Post screen display during bootup. By power cycling 2-3 times I could get to the Windows login screen - but still with no Post screen during bootup. PC would then work fine but "hang" when trying to login in the morning - PC is on 24/7/365.
- replaced monitor cable, no change.
- tried another monitor, no difference.
Reverted back to Windows 10 and PC runs normal again w/ Post screen at bootup. System - Supermicro X11SCZ-F motherboard w/ Xeon E-2146G, Quadro M2000 GPU, 64 GB Crucial ECC ram, Samsung 970 Pro M.2 NVME; three other 2.5" Samsung SSD's, Intel 750 SSD, and a 6TB Hitachi hardrive.