Windows 7 PC second monitor not detected

ArchBishops

Honorable
Dec 5, 2013
42
0
10,530
Morning,

I have plugged in 2 monitors to my Windows 7 PC via a VGA splitter. Currently the second monitor is showing the same as the first monitor. I want to change that so the displays are extended but the monitor is not detected on the screen resolution settings window of the control panel.

Can anyone help?