The phrase "to turn on" means to activate or start something, such as a machine, device, or system. It can also refer to the act of becoming excited or enthusiastic about something, or to initiating sexual activity with someone.
The silhouette of these lamps make for a beautiful accessory but when turned on at night also add some much needed ambient lighting to this area of the home. (zdesignathome.com)
Most of the time, the screen didn't turn on when I wanted it to, or it responded slower than I would've liked. (sammobile.com)
It is important to note that this service to support popular e-book formats is not turned on by default anymore. (goodereader.com)