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Have you double checked that (1) the mount is connected in PHD, (2) the setting in the Mount menu is correct, and (3) the guide cable is plugged in - firmly and to both ends? If you're using a serial -> USB adapter, it might be worth checking that the COM port numbers are correct in Control Panel. Otherwise, shut down the computer, power down everything, physically unplug and re-plug the cables, and try it all again?
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