I have both a GTX 650 and a GTX 770 graphics card and I've already tried installing both seperately (obviously). I have an AMD A8-5500 with integrated graphics on a MSI MS-7778 motherboard and i'm pretty sure I've tried everything I know to get them to work. When i install either card and power up, it just hangs on the "starting windows" screen indefinitely. I've upgraded the power supply to a corsair cx750m 750 watt power supply, connected the power to the card(s), fiddled with BIOS settings, disabled/uninstalled integrated graphics drivers, (even though it should disable them automatically when the card is installed) made sure the dvi cable was plugged in to the card, and a host of other possible solutions. Yet, i still get the windows 7 "starting windows" screen that hangs endlessly. Please help.