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PHD works fine for me - are you seeing the LED on the GPUSB change colour indicating it is receiving guide signals from the computer - could switch off DEC guiding and see if it is still changing colour. Also can you hear the mount responding to the guide signals when it is trying to calibrate. You should also see the star (and the PHD box I think) moving around the cross hairs when it is trying to calibrate. If it isn't moving and the first two checksare ok then perhaps the clutches are slipping?
Peter
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