Do you mean when you push the power button on the front the light does not come on? As mentioned above, the power needs to be on to watch OTA TV but the power button does nothing else to any other signal or button.
There should be a dedicated 7.5 DC amp fuse in the system so if you check the plug in the back of the controller and there is no power I would go look for the fuse. It's likely labeled TV antenna or TV boost or similar.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?