I'v got myself a new nvidia 7300 GS 512 MB graphics card (manufactured by Zebronics). I have a 915 GV chipset wid a 16X PCIE slot. Once I put in the card and plug my monitior 2 it, the screen goes blank. I havnt uninstalled my onboard Intel GMA 900 graphics drivers. Could that be a problem? Also I have a 250W 12V-14A power supply. Do I need a new one? Plz let me knw. What are the exact steps i must follow? Plz help!