You’ve connected to the right mount / driver, right?
• Once (in theory) connected to the mount, hit Ctrl-T. This will pop up a series of dialogs saying it will engage the motor in each direction. Once you hit OK, you get a 1 second pulse to that motor. Look and/or listen closely to your mount to determine if any change in position and/or motor noise happens when you hit OK. One person at least attached a long stick to the telescope so that the small guide motions could be magnified and he could see them. If you get some activity here – any activity – PHD is sending commands to the mount. If you don’t, it’s not. Start looking at your cables, your choice in the Mount menu or ASCOM dialog, etc.