Vizio Smart TV - X1 Not working

I connected my hdmi cable from my cable box to my new Vizio TV (it worked fine with my old Vizio). I get nothing but a blank screen. I tried to restart my X1 box by unplugging it as well as restarting it via signal...neither have worked. I get the Xfinity welcome/bienvenido screen, then it just goes blank after a brief high pitched beep. Any suggestions would be greatly appreciated. Thank you in advance!!!