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The HP 640C will connect to a PC with either a parallel or a USB cable. If you are connecting to a Mac computer, you will connect to your PC with a USB cable. I would recommend the USB cable for either the Mac or a PC as it is a better connection. If you do not have either of those cables you will need to buy one from your local computer accessory store. Turn off your printer and computer. Connect your cable to the printer and computer. Then boot your computer, and once the bootup finishes, turn on the printer. At that point you will have to install the software driver cd that came with the printer. If you do not have the software you can go to the HP website and download the correct drivers for your computer.