computer specs asus m5a99x evo motherboard amd 8 core fx-8150 8 gb ram (2x4gb) 750w power supply 80+ ati radeon 5700 1gb graphics i bought an asus m5a99x evo motherboard but it doesn't have in-built graphics so first i tried to use my ati radeon 5700hd(hdmi and dmi ports) but the installation kept failing then i used an ati 4500 (vga,dmi,hdmi ports) and windows 7 installed but the screen keeps going black for about 5 seconds every time i do something e.g. move the mouse, type, open apps. i havent touched the bios and is still set to default. btw the screen doesnt turn black in bios mode. i have tried both graphics cards in other desktops. My questions are: 1. can a operating system be installed on a computer that only has pci-e graphics with no vga port? 2.what graphic card(s) should i use for a m5a99x evo mothrboard? 3. is the screen problem caused by a bad driver or is it the motherboard? 4. does it need a larger power supply? 5. should i add more ram? 6. is ati better than nvida for an amd chip-set?