[SOLVED] No display when booting with hdmi cable plugged into 4k monitor

elk123

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Hi,

I have three monitors: 2 HD connected via dvi and 1 4k monitor (BenQ EW3270U ) plugged in via hdmi. This setup worked fine until I switched my motherboard and cpu today (I went from a gigabyte z97 gaming 5 with an i5 4690 k to a msi z490 pro a with an i9 10850k). Now whenever I start my computer up and the hdmi cable is plugged in, I do not get any display. I only get display (on my two HD screens) if I start the computer up with the hdmi cable from the BenQ unplugged. Once I start up, I can then plug in the hdmi cable to make use of my third screen. If I plug one of my HD screens in using the hdmi from my BenQ, there is no issue. I have tried lowering the resolution on the 4k. I have tried turning the power off on my 4k monitor when starting, but it I only get display if I remove the hdmi cable. I have also tried updating my graphics drivers and my bios... nothing has helped.

Does anyone have any idea how to fix this?

Thank you very much
 

elk123

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No, I tried all of that, it didn't work. I may have just solved the problem by changing the BIOS from UEFI to CME, will update after a few reboots.
 

Krotow

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Should be Ok. Though HDMI refresh rate for i9-10850K CPU on 4K resolution seems limited to 30 Hz. Try to connect motherboard monitor with DisplayPort cable instead of HDMI.
 

elk123

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Should be Ok. Though HDMI refresh rate for i9-10850K CPU on 4K resolution seems limited to 30 Hz. Try to connect motherboard monitor with DisplayPort cable instead of HDMI.
I don’t have DisplayPort cable, so I’ll have to order one. It just doesn’t seem to make sense that I can’t get anymore display if it is plugged in on boot. This wasn’t a problem with my previous motherboard
 

elk123

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No, I tried all of that, it didn't work. I may have just solved the problem by changing the BIOS from UEFI to CME, will update after a few reboots.
 

Krotow

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It is possible. Though BIOS does not have drivers, but HDMI display simply can't manage to recognize the signal source at time. There in TH and in Google search I noticed a bunch of questions about this topic - more related to 4K TVs but I believe it doesn't matter. Usual cause was UEFI or standard speed HDMI cable.
 

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