I have a recently purchased a refurbished Optiplex 7010 with the following specs:

• Intel Quad Core i7-3770
• Intel HD 4000 graphics
• 16GB Ram
• 512 SSD
• Windows 10 Pro
• 2- Display Ports
• 1-VGA Port

I had 3 different VGA monitors hooked up with 2-DP to VGA adapters and 1 directly to the VGA port. This worked fine and all three monitors displayed.

I was able to get 3 HP LP2465 monitors with DVI-I dual link 24-5 pin connectors. I hooked up 2 with DP to DVI-I dual link 24-5 pin adapters and 1 directly to the VGA with a DVI-I to VGA cord. After that I could only get two of the monitors to display. I did everything I could find on the internet such as unplugging, different cables, rebooting, trying to extend the display, uninstalling the HP displays and so on, and so on. I can change the output to any combination of the monitors in the Graphics Options Output, and the monitors will all work either individually or in any combination of two, but I cannot get all three to display at the same time. 

I went back and hooked up my original 3 VGA monitors and now they are acting the same way as the 3 HP monitors and will not display more than two at a time. With any of the monitors hooked up, Windows knows there is a third monitor there it just will not allow for displaying to all three.

Any help on how to resolve this issue would be greatly appreciated.