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Monitor No longer working - Suspect Motherboard?

Level 7

I recently replaced an extension cord that my two monitors were plugged into and afterwards one of them won't come back on. I do think the issue is potentially because I forgot to turn off the monitors before unplugging them from the plug but I can't for the life of me get them to turn back on.

Here's what's currently happening:

  • the one monitor works great

  • the other monitor powers up, but says "no signal"

Here's what I have tried

  • Restarting the monitors and my PC

  • Unplugging and replugging the HDMI's and Powercords properly this time (no change)

  • Switching the ports the HDMI's are plugged into (the other monitor then works and the one that was good, stops. This rules out the HDMI cords being the issue)

  • The port that doesn't seem to work anymore is the one plugged into my motherboard while the one in my graphics card works

NOTE: Yes I know, ideally both would be in my graphics card, but that's not in the budget right now but is high on the to-update list.

Any tips on what I need to do to get the motherboard port working again would be greatly appreciated as I've never encountered the issue.

My motherboard is an ASUS ROG STRIX B550-i


Customer Service Agent

Hello, @TigerRobot 

Could you please clarify if one of the monitors connected through an extension cord to the socket has no display issue?
If directly connected to the power socket instead of the extension cord, does the monitor still not display?
Are both monitors connected to a GPU for video signal output?
When testing one monitor at a time and trying different ports, does the issue of no display consistently occur with the same monitor?
If possible, provide more detailed information, such as the BIOS version, CPU, GPU, brand and model of relevant hardware components, and results of individual testing of monitors.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂

Hi @Jiaszzz_ROG 

Problem is consistent whether plugged directly into the outlet or to extension cords.

Like mentioned, one is plugged into the GPU one is plugged into the monitor. 

Like mentioned, when trying different ports the monitors switch, it is consistently only whoichever one is plugged into the motherboard port that has no signal. Eliminates both the hdmi cords and monitors from being the source of the problem. GPU port always works. 

Will check my BIOS version when I am home and advise.

Coolermaster 850w PSU

ASUS ROG STRIX B500-I Gaming Mobo

AMD Ryzen 5 5600G processor

ASUS GeForce RTX 3050 GPU

Corsair Ven RGB P SL 3600 8gb x2 (1822w)

Customer Service Agent

Hello, @TigerRobot 

Could you please confirm if the screen that cannot power on has been tested with another signal source to check for functionality?
Kindly consider updating to BIOS version 3607 released on May 9, 2024, after backing up, and refer to "[Motherboard] How to enable iGPU Multi-Monitor to have dual-screen display" to verify settings.
If the issue persists, please follow these steps to record a video:
Start recording.
> Verify the connections of both screens to the motherboard and GPU
> Boot after clearing CMOS
> Enter BIOS and confirm the information on the BIOS main page, and enable the [IGFX Multi-Monitor]
> Save settings and reboot to check how both screens display under the system.
Also, please provide the OS and OS build versions.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂