My computer bought is an old one. I recently bought a Sapphire AMD/ATI Radeon HD 6570 1 GB DDR3 Graphics Card and installed it. Things were going fine and one day, after some gaming, I put my pc into hibernation and after 1 hour or so, I came back and switched it on. Even though the fans and all powered up and lights came on in cpu, the monitor showed nothing. It was totally blank.
So, I started to unplug everything and checked again and again. Nothing came. When I showed it to one of the local service centers, they removed the graphics card, and plugged it to their monitor and everything worked fine. So, I came back and reconnected everything except the graphic card, but no response. So, I tested my monitor by connecting it to a laptop, and it worked fine.
What might be the problem?