i recently built a new system using the GA-K8NF-9 mobo. When i turn it on, all the fans spin, hard disks power up, but the screen doesn't turn on. I tried 2 different sticks of RAM, no luck. I checked if CPU is firmly in place, i tried 3 different video cards(radeon 9200se, geforce FX400, and an old PCI video card)...Somebody PLEASE help!!! puke: