I bought a computer with a 40gb HDD with Windows XP.(The motherboard has two HDD ports) I Put a 160 gb hard drive in for additional space, but I also installed Windows Vista on the 160gb HDD. Im running Vista now on the new HDD. I have another 160GB HDD I want to install, but everytime I unhook the 40gb HDD, and install the 2nd 160gb HDD, I just get a black screen. It will no longer boot even though the OS is still on the 1st 160gb HDD. Any ideas how to resolve this?