I got a Gateway DX4300 PC from work that was being gotten rid of, and the hard drive is dying. I just went on eBay and bought a replacement, which is a Seagate. Anyways, I can open the CD drive via the buttons on the top, but only if certain Gateway software is on the computer. When I get the replacement hard drive, I need to be able to install the OS from the DVD-ROM. How can I open the DVD drive from the command line, since Windows will be unavailable?