horizontal lines on hd 7770

G

Guest

Guest
I god a new hd 7770 ghz flex edition every thing works great but when i watch any video or if i run windows experience index ( on tuning windows media decoding) i got black screen with white horizontal lines,and some times only white screen then i need to reboot

my pc:
phenom x4 965 be
asrock 880gmh/u3s3
corsair vengense 2x2gb 1600mhz
samsung hd 322gj
sapphire hd 7770 ghz flex edition
corsair cx 430 v2

I already tried to change drivers,make a clean installation of win 7 64bit,but then i put my old geforce 6600 and it all works.my question is this.is my proble gpu or psu or something else