It's probably on "Energy Saving" mode. That happened to my wife and me too. Just hit the Settings button on the remote (should be a gear icon i think), or you can shake the remote so that the cursor appears and click the gear icon in the upper right hand corner of the screen. Anyway, in the settings there's a tab that controls the "Picture" mode and you can switch between different options like "Vivid, Cinema, Game, Standard, Energy Saving..." etc. When I did that it made the screen brighter. I think you can go even deeper into the settings and manually adjust the brightness if you want as well. That will show up on the left side of the screen. My favorite setting is Vivid.