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?
im using seasonic 600w 80+ its enough?
That is more than enough to run a 7990 card without problems because it is a good brand and when mining the 7990 goes up to 400-450 watt power consumption in Ethereum with a bit of undervolt. If you have overclocked your card then it is a PSU problem as this cards needs 573 watt under extreme load conditions. Try also changing drivers.
http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
Download DDU, uninstall the drivers , restart your computer and download the latest version of Radeon Crimson driver from the official page of AMD. Everything should be fine by then.