xfx hd 6670 display problem

hello everyone, i am having a major problem with my gpu hd 6670 ddr3, when i install the gpu and turn on the pc the screen frequently dies and comes backs to life, this happens randomly between 3 - 4 seconds of interval ..... any help would be useful ..
 
my monitor is samsung 20 inch led syncmaster SA300 the wires are good my monitor only supports vga so i am using vga input and output well i cannot record the temp of the gpu because when i install my gpu and run my pc it almost becomes inaccessible :(


 
my monitor is samsung 20 inch led syncmaster SA300 the wires are good my monitor only supports vga so i am using vga input and output well i cannot record the temp of the gpu because when i install my gpu and run my pc it almost becomes inaccessible :(