After successfully setting up EQ and imaging the moon without issues I targeted a star cluster and it was located and could be seen on live view in stargazing mode. I commenced imaging and after enhancement etc the stacking failed. There was nothing visible in the live mode, just a black screen. I attempted to go to another object but after showing it was on target it would not center it. Switching to live mode showed a black screen. Re-booted and switched of and on on numerous occasions to no avail. Attempted to again set up EQ mode but would not obtain Polar Align Deviation, attempted Alt Az set up also to no avail. Uninstalled and re-installed app to no avail. There is a black screen in scenery mode as well.