2nd display in a dual display set up won't has no input signal

Question

Brand new Dell OptiPlex 9020 - Core i7 4790 3.6 GHz desktop https://www.cdw.com/shop/products/Dell-OptiPlex-9020-Core-i7-4790-3.6-GHz-8-GB-500-GB/3851732.aspx?pfm=reo#PO and 2 Viewsonic 22' display monitors. The Dell has a VGA and 2 displayport connections to the motherboard. It also has a DVI connection to the GPU. The Viewsonics have DVI and VGA outputs.
The first display is connected to the motherboard's VGA port and works fine. I tried connecting the second display to the GPU's DVI port but got no signal. Added a DVI to Displayport adaptor and connected it to the motherboard's Displayport and still have no signal. Does a function need to be changed on the computer or do I need to download/update drivers for the display to read? I believe it should be plug n play, so not sure why I'm having this no signal issue.

Answer 1

Your problem is that you're trying to use to different GPU sources at one time. You're trying to utilize the integrated and dedicated graphics at once. You need to either use two display ports from the motherboards integrated graphics, or two display ports from the dedicated GPU. Based on the information you gave, it sounds like the GPU only has one DVI port and that's it. So in order to use dual monitors, you'll have to a combination of two ports from the integrated graphics.