Are there tricks for turning on your LG840G power button is broke?

If the power button on your LG840G is broken, you can try charging the phone, as it may turn on automatically when plugged in. Alternatively, you can use the volume buttons to reset the device by holding both the volume up and down buttons simultaneously for about 10 seconds. If these methods don't work, consider using a third-party app that allows you to turn the screen on or off through other means, if your phone is already on.