I had a black-screen issue upgrading a laptop to Windows 10. This particular laptop had a discrete NVIDIA graphics chipset built in. I finally discovered that uninstalling the display adapter from the Windows device manager prior to initiating the upgrade (and checking the "delete the drivers for this device" checkbox that popped up during the uninstall) solved the problem. This causes Windows to use a generic set of video drivers for your screen that behave better during the upgrade process. Once Windows 10 is safely installed you can re-install the drivers for your specific chipset (although i n my case I did not have to do that as Windows 10 figured it out on its own and did the right thing).
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