Did this just start doing this?
How often was the set used and when was the last time?
Have you unplugged the set for a few minutes, plugged in back in and tried it again?
Is the backlight turning on?
Might be a PS issue.
BTW, welcome to the forums.
Abundant OTA television is what makes this country different from all others. Lets keep it this way. If you like Wi-Fi so much, OTA fits right in. After all, it is wireless.