after a catastrophic clean install of Windows 10, where I had to make sure to have Intel Management Engine driver version 9.5, or else my laptop wouldn't properly shut down; and Intel Graphics display driver with Windows Display Driver Model version lower than 2, or else the drivers for my Nvidia chip wouldn't work, I decided to make a factory reset of my Vostro 5470 with its Windows 8.1, to have everything working properly as shipped.
Much to my surprise, the drivers for my GeForce 740M are not working. I have the Intel Graphics Family driver version 10.18.10.3345, and Dxdiag tells me I have WDDM 1.3. I tried to install the Nvidia drivers either from Dell (Video_Driver_R4HJ8_WN_188.8.131.5265_A02) or directly from Nvidia. My GeForce will simply not work. It shows the yellow exclamation mark on device manager. If I try to run the Nvidia control panel, I'll even receive an error message telling me I don't have an Nvidia card installed.
Solved! Go to Solution.
OK, it's now working. I'm posting this as a follow-up to my own post so someone else may possibly be benefitted from my experience.
After a whole day of frustration, I managed to get it working after flashing the BIOS. It should be emphasized that I had a full factory reset of my Vostro 5470, with disk repartitioning and all that. Even in this case, the Nvidia drivers were not working, contrary to what one would expect. I should mention then that during the days I used Windows 10, I had updated the BIOS, so that could be a factor. Today I flashed the BIOS to the same version, as I'm already using the latest release. After that, I installed the Nvidia drivers again and now it worked. I already updated the drivers and everything seems OK.
Cheers and good luck for you reading this.