I have just built a system. It won't boot up when my new pci-express card is installed per instructions; I get POST beep code for video problem. I pulled that card out and put my older pci card in a regualr pci slot, and system booted fine. I want the pci-express card in this system. What am I doing wrong? Is my pci-express card bad? mb= asus a8n-sli cpu= amd 3800 x2 case= antec 430watt ram=kingston 512 hd=seagate 300mb sata dvd=nec 3540 dvdr/w floppy = maddog floppy video card=Powercolor R37L-SC3D Radeon X300 SE 256MB HyperMemory(tm)* PCI Express 128MB VRAM Video Card w/TV-Out & DVI When comp boots [with normal pci], everything works [all of ram is recognized, dvd works, hdd works, etc., all fans on]. This mb is supposed to run pci-express: it actually is made to run 2 pci-express together, but also is supposed to run with one. I have tried the pci-expres card in both the slot indicated for solo pci-express card, and the slot that should be taken by 2nd pci-express card. Thanks in advance!!