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Are you using the onboard video or you have a video card installed?
Make sure you have the latest BIOS and drivers update, you can download the latest graphics driver here:
I suggest to uninstall the older version and to install this latest driver version.
When you install the latest graphics driver from the link above right click on the desktop and click the Intel® graphics properly once it is open press <Ctrl><Alt><F8> on your keyboard to set it to defaults.
If the driver update does not solve the issue please try the following:
Make sure you have a good power supply that provides enough power to your entire system.
Try different cable or try the cable in another system
Test the monitor with another system if it is possible
If nothing works, power off your system and unplug the power cable from your outlet, make sure the monitor power is off and unplug as well, leave it like that for few minutes and then connect everything back on again.
Check and see how it goes after you plug you components back.
If nothing works, I suggest to contact your motherboard's manufacturer for proper dual monitor set up.
I hope this can help
The solution was to reset the second monitor to factory defaults...
Now it works ok