I recently built a computer about 1 week ago and it was working fine....until today. i have the asus maximus vii hero mobo rnning sli gtx 980s. i have a 1440p monitor connected via displayport and a 1080p monitor via HDMI. Today I tried to install a sound card in my 3rd pciex16 slot and in doing so I think it may have disabled one of the other pciex16 slots that my video cards were in because now only my 1080p monitor is useable and my 1440p says no signal detected. After removing the sound card to return my system to the original state the problem persist though. Ont he nvidia control panel i can even see my 1440p monitor on the list but it will not allow me to check the box to enable it. pls help.