i'm taking a bit of a guess as to what your problem actually is, but is your monitor plugged in to the GPU or onboard video?
plugged in to gpu
detail like this :
i have installed the amd driver at my computer, maybe 17.xx so the driver automatic install, then my computer blank.
i try uninstall using Display driver uninstaller at safe mode and download the new driver from amd site, but get error again in mid instalation, my computer get blank, i dont know why..
must i use windows 7 to use 7990?