Dual Monitor using Integrated graphics on MSI B450M MORTAR MAX

Did you try plugging it in when the OS had booted and then turning the monitor on? Also I assume you are running the correct and latest driers for both the CPU and GPU?

Thanks, yes. Also tried that. All drivers are up to date. It's very weird.

Another solution could be to install a graphics card with 2 ports. What's cheap and good enough for windows 10?
 
Literally anything that has two outputs that suit your monitors. Maybe an older card from the MM, put a wanted advert in there? £20 plus postage should cover you for something.

It's a very odd situation that you've got, I've tested my board in many different configurations, and I've even booted from a Windows 10 USB SSD that I have for testing systems and that works without issue.
 
Literally anything that has two outputs that suit your monitors. Maybe an older card from the MM, put a wanted advert in there? £20 plus postage should cover you for something.

It's a very odd situation that you've got, I've tested my board in many different configurations, and I've even booted from a Windows 10 USB SSD that I have for testing systems and that works without issue.

Thanks for all the advice!
 
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