Thank you for joining the Intel communities.
I understand that you are getting this issue only when connect an external display but it works OK with the laptop display, correct?
Do you have the external display connected via HDMI or display port? Is it straight connection or are you using any adapters?
Have you tried different cables?
Please try uninstalling the graphics driver and reinstall the Intel® graphics driver manually, see Uninstalling the Intel® Graphics Driver and Intel® Display HDMI/Audio Driver
Please see How to Manually Install an Intel® Graphics Driver in Windows® 10 & Windows 8* or Windows 8.1*
I'm just following on this thread to ask you if your issue was resolved with the information provided above or if you still need further assistance.
I believe my symptoms are the same:
1. When opening Word my external monitor goes blank, the laptop monitor comes on for a brief moment and goes dark almost immediately, my external monitor comes back on after a few seconds.
2. A similar sequence of events happens sometimes with Chrome, Edge, Outlook, and other applications. This also happens from time to time while I am already working in one particular applications. Not only when I switch applications.
Those symptoms don't occur every time but quite often.
All drivers and S/W have been updated. (Windows 10)
I have an external Dell U2713HM and USB-c to DVI. Initially I thought it was my USB-C to DVI adapter. I replaced it (this is my third - each time a different manufacturer), including one of them using HDMI instead of DVI. Always the same problem. In addition, from time to time, I have a thin horizontal black line flashing accross the screen (most likely showing that from-time-to-time some of the horizontal scan lines are not re-drawn properly). All of the symptoms occur when either static or dynamic (video) images are displayed.
The graphics driver that you have installed on this system we have tested and we don’t experience this issue, at this point I suggest you to contact your system manufacturer to get better support for the configuration you want to do.
However, you can try installing this driver from the Intel website:
I suggest you to follow the steps I posted above to install this driver.
I’m just following on this thread to ask you if your issue was resolved or if you still need further assistance. If the issue was not resolved, I suggest you to install the latest Beta driver released.