I had the same experience. I have NVidia GeForce GT 630 PCI Express video card.
Before starting the upgrade to W10, I downloaded and installed the latest Windows 7 driver from NVidia.
After installing the upgrade to W10, I had black borders around my display.
W10 Device Manager showed a yellow triangle on the Display Adapter. Initially it didn't, but later it did.
I think yellow triangle shows up after I did my first Windows Update.
So, I downloaded and installed the latest Windows 10 driver from NVidia and that fixed it.
The borders are fine now.
I did need to make one setting change, as explained below.
In NVidia Control Panel > Change Resolution. I changed "Output Dynamic Range" to Full from Limited.
The default setting is Limited. Limited is for a TV, and Full is for a Monitor. My monitor is a Dell U2414H.
Hope this helps,
Lilla
07-30-2015 03:37 AM