Help, windows 8.1 isn't detecting my second monitor.

[gamesd934]

Windows 8.1 on my main tower isn't detecting my second monitor. I have tested the monitor with 8.1 laptop and it works.

 

[alkaufmann]

Are the two monitors connected to the same video card? If the answer is no, check the bios and make sure the onboard video connection is enabled.

 

[Xx3qmxX]

Give us your full specs of your tower and I will probably find out the problem.

 

[CountMike]

Give us your full specs of your tower and I will probably find out the problem.

AND monitors, most newer video cards can't service two analog monitors at the same time. At least one has to be digital.