I have this motherboard and I have been using the intel HD graphics on the I7-3770k Quad-Core 3.5GHz LGA 1155 chip just fine. I just bought the Gigabyte GeForce GTX 660 TI Windforce 2x OC GV-N66TOC-2 graphics card and when I put it into the PCIex16 slot and powered up the computer, no picture appeared on my monitor - I have it connected via HDMI. When I disconnect the cable from the graphics card and connect it to the motherboard's HDMI port, I get a picture and I see that the computer successfully booted up into my 64bit Win7. The 'Init Display First' is set to Auto and Internal Graphics set to Auto. I know the card works because I put it in my older Gigabyte GA-EX58-DS4 board and it works just fine. I put my older BFG Geforce GTX 260 in the Z77X PCIex16 slot and it works just fine. I have the F12 bios installed. I've spend 20 hours researching this problem and I'm turning to all of you for help - Gigabyte was no help. Thanks ahead of time.
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8/27/12 at 3:03pm