Monitor goes black for a second then comes back on

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1

I recently got a new PC, and after connecting it to my LG Ultrawide via HDMI, I noticed that randomly, maybe every hour, the screen would go black and come back on. Any ideas?

2

So, you aren’t giving very much info, so this is going off my experience for a similar thing, but may not be the same.

I have an Ryzen 3 3200G, and use a 4K HDR TV for a monitor. For a little while, I would have 2 things happening at once.

The AMD driver would crash. I uninstalled the driver using DDU, and reinstalled the latest driver.

At the same time, my TV would go into Gaming Mode when switching between applications. The screen would blank, then come back in and out of Gaming mode if I went full screen.

I solved this by forcing my display to a set mode.

So, you can check for both of these things, or similar for your setup. Otherwise, you need to provide more info, like is there something that triggers it, What OS, are you in HDR mode, do you have AutoHDR on, etc.

Then read the TV manual and find settings that automatically change modes to see if that is the issue.

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I had this issue with my laptop and 4K display a few weeks ago. I only fixed it by forcing its HDMI output to 30 Hz. The system was setting it to 59.94 Hz upon plugging in the cable and the display would flicker every few seconds or so. It was definitely not the cables, because I swapped it with another which definitely worked at 60 Hz.

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I’ll try this, thank you.

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It is possible that the cable is bad and the old pc was able to mask that, but not the new one.
Thy with a different HDMI cable

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To throw my hat in the ring, check that you cable can actually support the resolution + refresh rate. If you have a club3d or other cable that is doing DisplayPort to HDMI, your cable probably needs a firmware update.
Lastly, make sure that you have Full Color turned on on your monitor and if you are using HDR, you can run the HDR calibrator in MS Windows (if you are on Windows) and it will give you the results of whether you computer can actually support HDR at the resolution + refresh rate that you are running.

All this without much information to run on.

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