Windows 10: Why does my monitor go black at start up?

When i turn on my pc, it starts but the screen goes black, why does the screen go black...the screen is fine in safe mode.

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Desktop with dual monitors one black

Hi Frank,

Thank you for your interest in Windows 10.

I understand the you have tried to resolve the issue and tried many steps. I really appreciate your efforts in resolving this issue. As you have mentioned that switching the cables make both the monitor
work so I believe its not the driver issue. I would suggest you to try connecting another cable and check if the issue persists.

Below is the Microsoft help article on How to connect a second monitor/ Multi monitors.

Note: The steps for Windows 8/8.1 applies to Windows 10.

http://windows.microsoft.com/en-US/windows-8/how-connect-multiple-monitors

If you are facing black screen issue on the second monitor I suggest you to refer to the below thread and follow the steps given:

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Hope this will fix the issue, if not let us know with the updated status and we will be happy to assist you further.

Thank You.

 

Overclocking / Undervolting guide for Vega 56 or 64?

Here's a quick laundry list:

List of software to use for overclocking and testing
Examples:
Wattman (and how to find and use it, like an overview, including profiles)
Unigine Valley or Heaven (use this for quick testing while changing settings in Wattman and checking for stability / artifacts) ...just suggesting this
How to monitor cores / mem speeds and temps during testing (I've seen screen overlays, and others using GPUz)

Step-by step overclocking in Wattman
Fan speeds
Power limit
Temp limit
Voltages
Core speeds
Memory speeds

 

External monitor blanking often

Hi,

Please answer these questions to assist you better.

• What is the make and model of your computer and external monitor?
• Have you installed all pending Windows and driver updates?
• Do you get any error message?

I suggest you to install all pending Windows updates in your PC and also update Display drivers. Follow the steps below.

Step 1: I would suggest you to check and install any latest Windows Updates available.

• Go to Start and then Settings.
• Click on Update and Recovery.
• Check for updates under
  Windows Updates.
• Restart the system and check if the issue is resolved.

Step 2: Please refer to the following Wiki article created by
Andre Da Costa on How to: Install and Update drivers in Windows 10.

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Do let us know if you still get random black screen in the external monitor. Thank you.