I just put together my new system. ASROCK conroe-xfire board, x1900xtx card, e6300 cpu and 2GB OCZ ram. I have power to all devices but when I power on the computer the screen is blank. No beeping sounds. I tried reseating the video card several times and it didn't help. I also tried putting it in the slower PCI-e slot and it did no good. I also have a new 550 power supply that I've confirmed is good. Is the video card defective?Any help?