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I have a problem with my iOptron ZEQ25GT mount. When switching it on the mount the Go2Nova 8408 Hand Controller does not start nor does is there a beeping noise. However the red light top of the mount does come on and the Polar alignment scope reticle also displays it's red light, so it would seem that mount circuit board has power. Is there any suggestions as to how to diagnose and troubleshoot the issue? I have tried re-seating the ribbon cable in the controller connecting the controller circuit board to the LCD display but had no luck. The real issue is that I am not able to determine which component has failed.