Asrock extreme 4 gen 3 won't boot with my gtx 670 plugged in. I keep getting error b2. I tried moving around the ram, still the same. I plugged in my gtx 560 and it worked though. I also booted on the in the integrated vga and could see that the gtx 670 was shown in device manager without any errors. I'm confused. If the card was dead why does it still show in device manager?
some of the z77 and newer chipset had a issue with some of the high end nvidia video cards. (post issues). make sure your mb has the newest bios. boot using the onboard video and on the first page of the bios page is the bios rev info. go to the mb vendor web page and download the newest bios and use the mb bios updater to update the bios.