Computer display won't work?

I installed this video card today, http://www.diamondmm.com/7770pe51gdd-diamond-amd-r... along with a new corsair cx500 power supply. When I turned on my computer first everything was fine. I went to do the bios fix update since I heard this video card tends to cause a computer to crash often before doing the bios update. After it prompted me to restart my computer, which I did, and now the monitor won't display anything. The monitor is currently plugged into the new card with a DVI cord. I tried plugging the monitor back into the integrated card and still no signal. This is my computer http://h10025.www1.hp.com/ewfrf/wc/document?cc=uk&... Please help me.