Anthony,
Go to File > Project Settings > General.
Under Video Rendering and Playback, ensure that the Renderer is set to Mercury Playback (Cuda) not Mercury Playback (Open CL) and definitely not Software Only. I would re-enable your intel GPU before you do this.
If my Program and Source monitor stop working, I will check these and toggle between Software Only and then back to Cuda and it brings my monitors back.
Let me know if this works for you.