OK so i'm pretty sure this has been asked in someway before. However I cant seem to find an answer that will work.

I'm trying to run three monitors with my Asus HD 7970 DirectCU ii. I have two DVI cables (one is dual link) and a DP to HDMI cable.

my monitors are Asus MX299Q, LG E2411, and Acer P236H. Every time I add the DVI for the third monitor I loose my main one. I read something on flipping the small switch on the card itself but that didn't seem to do anything. Any help would be awesome thanks. Sorry if this has be answered somewhere before.