I have a Dell Inspiron 620 and I recently got a graphics card to be able to support two monitors. I bought a Visontek RADEON HD 6450 off of Amazon. It came in a fresh package that had been Un opened. I then took it out and followed the guide to install it. I disabled my video card that is built into the motherboard and uninstalled and removed the driver and software. Now I run the PC with the Graphics Card in and connected to my monitor using a VA port yet nothing happens with the screen yet fans in the PC start spinning. Please help