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The newer HP printers come with a "Toolbox" program that is accessible via the START button or by clicking in the folder for that printer. One of the diagnostic features is something to check the bidirectional communication ability of your cable. If your cable has bad pins or wires, then this test should reveal something about the cable or whether or not you've damaged the parallel port by static electricity. The classic is walking on carpet while wearing acylic socks -- a recipe for disaster when touching electronic connectors.
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