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Step 1
Plug the printer into the wall outlet using its AC adapter, but do not turn the printer on yet. This will be done at a later time when the installation software asks you to do so. Using the included USB cable, plug one end into the USB port on the back of the printer, and the other one into any USB port located on the front or back of your computer. If you do not have a USB cable or need a longer one, they are available for purchase at any major electronics store.
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Step 2
Insert the installation CD, and a setup wizard will automatically appear. If you do not have the CD, you can download the official drivers (the installation files) from Lexmark's website (see Resources below). Follow the setup wizard's instructions, clicking "Next" as needed and answering any questions it may present for you. At the end of the installation, the wizard will ask you to turn the printer on. Upon doing so, your computer will recognize the new printer and the installation will be complete.
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Step 3
Print a test page to see if the installation was successful. Any text file, photograph or Web page can be used for this test. If the newly installed Lexmark X75 is not your default printer, you may have to select it from a drop-down box when you try to print a document.