Firstly, are you using the native "TheSky" telescope drivers or the ASCOM Telescope API integrated with TheSky? In TheSky or the ASCOM POTH (Plain Old Telescope Hub) you can view the serial line communication sequences. Verify your computer is actually sending the LX200 protocol commands and receiving an OK back from the scope.
I'm assuming this worked fine before or is this the first time you've tried it?
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