I have a problem where when I replaced the graphics card on a Dell Vestro with the i5 2100, the screen pops up with no signal. The original graphics card, the Nvidia 9500GT, works perfectly fine with the PC and works well. It's just when I insert my refurbished AMD Radeon 8570 the screen says no signal. The fans spin and everything. I'm a noob at this so simple terms please. I don't know the Motherboard or ram etc.