I had the same problem, my Monitor blacking out for no reason and out of the blue. I called Dell support, paid $59.00 (UGH) and this is what they said. With all the Microsoft updates that occur, sometimes the updates are not compatible with our computers and the drivers get corrupted. (Drivers to monitor and to our printers) Nothing major, she just deleted my drivers and they reinstalled themselves when my computer booted up. Sounds simple and here is what she did:
1) My computer, right click on it.
2) Go to "Manage"
3) Go to Device Manage
4) Display Adapters, uninstall both by right clicking and then uninstall
5) Reinstall your computer. The drivers will update automatically.