One potential such problem is that the TV will seemingly be on, with the power light visible, but there's no picture, just a black screen. Specific to Vizio TVs, this is likely a common concern ...

VIZIO 43” Class Full HD 1080p LED Smart TV VIZIO 43” Class Full HD 1080p ... and a customizable Home Screen with VIZIO Home, as well as Bluetooth headphone support for uninterrupted listening.