I have just upgraded Windows on a Dell PC from from 7 to 8. All went swimmingly until I tried to re-install graphics drivers for a GeForce GT 630. After the NVidia setup program completed, it requested a restart - I obliged, and now it goes to a black screen after the windows loading animation. It's odd actually - the screen blinks as if only receiving power every three seconds or so, for just a second (when it just shows a black screen), before going actually dead again.
How can I fix this? Or at least get into Windows in Safe Mode?
Single HDMI cable has been plugged, unplugged, and re-plugged to no avail. Its a 64-bit machine, running a 64 bit Windows 8 upgrade where nothing was kept from an old 64-bit Windows 7 version.