I’m having a problem with my software. when i plug in my calc to the computer and open the software i dont see my calc pop up it says “connectivity with TI-Nspire handhelds is unavailable”, its a ti-nspire cx. Any suggestions?

I was trying to install ndless on my cx and the screen goes blank then the calculator reboots but it never gets past the little clock after the welcome loading and then it goes back to do the same thing again. The whole process begins again it never stops what is going on!!