In a few days I have to check the error by a Remote Desktop Connection with TeamViewer or similar, but if I have well understoodd from the customer, the really strange trouble it's that there's not ANY UNRECOGNIZED GRAPHIC CARD in the device manager
In the device manager graphic card section, there's nothing: nothing working good and nothing bad or unrecognized.
I have told the customer to make a fresh install of Win10 on the computer, and see what happens... Tomorrow I'm busy with another customer in the lab, I hope to update this thread before this weekend.
EDIT: "NOT AT ALL" about everything! Customer really didn't explain the trouble.
The graphic card wasn't absent on the device manager (it was really impossible) but recognized as GENERIC GRAPHIC CARD. I've told him to make few adjustements and if unsuccessful, format the HDD and make a fresh installation, because with this graphic card the factory preload is useful only if completed with only on-CPU Intel HD Graphics