Multi Display work not at Windows booting !
After Windows load the GPU Driver, all Display get Signal. That is normal.
Yeah, but the question is not about dual screen in booting mode. It is not working when Windows has loaded.
Have you in Motherboard Bios Setting, Multidisplay on Enable ?
This message was posted on behalf of Intel Corporation
What is your motherboard, processor and monitor model?
Do you have the latest graphics driver installed? If not, try installing the latest version, you can download it here:
Before installing the driver uninstall the one you have installed, please see Uninstalling the Intel® Graphics Driver and Intel® Display HDMI/Audio Driver
Once the driver is uninstalled, you can go ahead and Manually Install an Intel® Graphics Driver in Windows® 10 & Windows 8* or Windows 8.1*
If the troubleshooting steps above does not solve the problem, are you able to use a straight connection preferable HDMI from your motherboard to the monitor/TV or perhaps DisplayPort on your motherboard to the monitor/TV?