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A few days ago, I posted an inquiry about my zip drive difficulties with my TP560. It turns out that the parallel port is the problem (I can't print, the CD-ROM doesn't work).. A friend called IBM tech support last night, and tried a couple of things, including running a Looptest (F1 for Easy-Setup, test on parallel port, Ctrl-A for Tool and Looptest). They ran the Looptest with the zip drive, but it should be run with a loopback cable. The three local places IBM suggested were a) uninterested since I didn't buy from them, b) closed, and c) closed. The fourth place had not heard of a loopback cable. What is a loopback cable, and what is the problem I am looking for? Am I going to be replacing the parallel port? The machine is about 6 months old. Any advice? Thanks, Wyn