Tomorrow i got replacement for my hd 6670. As installed it on my pc and booted up it worked normally. Then i hit shutdown and booted up but no display. Then i tried it with another gpu it worked normal which was gt610. After which i again installed hd 6670, pc booted up normally but same thing happened after shut down every single fan keeps running but no display. But some times when i press reset button pc boot up normally. When these thing happens fan of gpu keep running at full rpm with lots of noise.