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Your printer doesn't print, and the power light is off.

You forgot to turn on the printer's power switch.

Turn on the printer power switch.

You get a line of meaningless characters that bears no resemblance to your document.

You're using either the wrong baud, the wrong number of data bits or stop bits, the wrong kind of parity, a loose cable, or the wrong cable.

First check the tightness of the cable because that's the easiest thing to adjust. If that's not the problem, check the manual that came with your printer to see how your printer expects to receive data from the computer, and then use that information to answer printer-specification questions in the application. If your application doesn't ask for your printer's specifications, use the information to reconfigure the printer port by using the Control Panel Program, explained in Appendix A. If you're sure your printer specifications are right, take your cable to your authorized Apple dealer and make sure it's the right kind.