Have been banging my head for 2 weeks now trying to solve the grey screen of death. Jumped through all kinds of ridiculous hoops, ended with totally reloading Windows and STILL HAD the problem. FINALLY found the issue!
I am running a 5 year old Lenovo laptop with windows-pro installed. When I upgraded from 7 to 10, the Win10-1790 was installed. This version has an issue with the Sleep mode, which trips off the dreaded grey screen. If sleep mode is swapped for hibernate it seems to actually work properly! Get there from Windows key, settings , power