This is a long shot but worth a try.
Open up the hand controller and check the connectors. I had this happen to my Celestron, I pulled apart the single arm fork mount to check any signs of short circut etc, then I opened up the hand controller and found the connector between the main board and the cable is detached.
Give it a go, you only need a small Philips screwdriver.
Cheers,
Bo
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