4K display black screen when updated NVIDIA driver from 340 to any 340+ driver

[AminSadeghi]

All xorg logs are from a boot with only the Dell HD monitor connected.
Please connect the HP monitor, boot, log into black screen, reboot with HD monitor and immediately run nvidia-bug-report.sh as root and attach the resulting .gz file to your post. Hovering the mouse over an existing post of yours will reveal a paperclip icon.
https://devtalk.nvidia.com/default/topic/1043347/announcements/attaching-files-to-forum-topics-posts/

I really appreciate your help. I did as you requested. Here’s the .gz file.
nvidia-bug-report.log.gz (303 KB)