Second Monitor Randomly Turns Off? Here’s How to Fix It.

If your second monitor keeps turning on and off, you’re not alone. Many Windows users are reporting this issue as well. You can fix the problem with one of the methods below.

Method 1: Reconnect the second monitor
Method 2: Check the video cable and video connectors
Method 3: Update graphics card drivers
Method 4: Factory reset the second monitor
Method 5: Connect two monitors using the same type video connector
Method 6: Test the second monitor


Method 1: Reconnect the second monitor

To fix the second monitor randomly turns off issue, the simple method you can try is to reconnect the monitor.

1) Power off your computer.

2) Unplug the second monitor from your computer.

3) Plug the monitor back in again. Ensure you’ve plugged the monitor firmly both at the computer end and the monitor end.

4) Turn on your computer again, and check to see if the problem is resolved.


Method 2: Check the video cable and video connector

The problem can be caused by damaged video cable or video port. Follow steps below to troubleshoot the hardware issues.

  • Check the video cable and see if it’s damaged. If possible, you can test with a new video cable.
  • Check the video connector in the computer and the video connector in the monitor. If they’re bent or damaged, you need to replace it with a new one.

Method 3: Update graphics card drivers

Faulty or outdated graphics card drivers can cause your second monitor to keep turning on and off. To fix the problem, you can try to update the graphics card drivers on your computer.
You can go to your PC manufacturer’s website to download the latest graphics card drivers. Before you get started, you need to determine what Windows version you have and what graphics card model you have.

If manually updating drivers is not easy for you, you can update drivers with a third-party driver update utility. Most driver update utilities allow you to update drivers with a few clicks; just search for a trustworthy one. If you’re not sure which is good to use, you can try Driver Booster.


Method 4: Factory reset the second monitor

Some users have reported they had resolved the problem by factoring resetting the monitor. So you can try to reset your second monitor as well. The steps of factory resetting may vary from monitor to monitor. It’s recommended you follow the instructions on the monitor user manual to reset the monitor. If you don’t have a user manual, you can refer to the steps below.

1) Press the menu button on the monitor to bring up the OSD (On-screen Display) menu. You’ll see there are multiple buttons on the monitor. If you’re not sure which one is the menu button, press them one by one until you see the OSD menu icon pop up.

2) Once you open the OSD menu, navigate to the settings (usually named Others/Other Settings) which contains the Factory Reset option. You need to press the buttons on the monitor to switch between the settings.

3) Continue to navigate to Factory Reset. Once Factory Reset is selected, press the button to apply it.


Method 5: Connect two monitors using the same type video connector

If you connect the two monitors using two different types of video connectors, the problem can occur due to unbalanced load for two monitors. So try to connect two monitors using the same type video connector.

For example, if you connect the primary monitor to the computer with DisplayPort, connect the second monitor to the computer with DisplayPort too. This requires your computer has more than one DisplayPort. If your computer doesn’t satisfy the requirements, you’ll need to use an adapter like HDMI-DisplayPort adapter.


Method 6: Test the second monitor

If none of the methods resolves the problem, the cause may be the monitor itself. For example, the monitor doesn’t work properly at higher power conditions. If possible, test the second monitor on another computer and see if the problem persists.

Or you can unplug the primary monitor and only use the second monitor. After that, check to see if the problem persists. If the problem persists, you might need to replace it with a new one. If the monitor is still under warranty, contact the vendor for assistance.


Hopefully you can fix the second monitor keeps turning on and off issue with the methods above. If you have any questions, ideas or suggestions, feel free to leave a comment below.

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