I was wanting to utilize my older tower since I have storage for more drives, etc, versus my newer Gateway SX model. The SX model has a fully functioning Windows 8 OS on it. The older DX4640 model had Vista so I was just planning on removing the hard drive from newer computer and placing in the DX model (older). Bios recognizes the hard drive, yet when I boot the drive it gets the Gateway splash screen, then reverts to black screen with blinking underscore/dash. Any ideas? Something told me it couldn't be as simple as swapping drives...