Just got this Hisense F42K20e. Hooked it up, and it's not recognizing the cable input: says "No signal!" Cable was working fine hooked up to older TV, so it's not the cable input. It gets input from a ROKU box and an Xbox 360, looks fine, but nothing from the cable, or from the DVD player running through the cable box. Is it possible that it's anything OTHER than a bad connection on the Hisense?

Televison & Video - Generic - Hisense 42" Class LED-LCD 1080p 60Hz HDTV,1.5" ultra-slim...