I received my new Sapphire HD 4870 today. I installed it, and it will not post. Right now one of the red lights on the back of the card is on if you hold it where the DVI ports are facing away from you its the third light from the left. I have not flashed the bios. Im using it with Gigabyte GA P-35C DS3R and a Corsair 620HX psu. Any help would be appreciated I really don't want to RMA this.