Your camera’s LED light might not be turning on because the battery on your camera is low and needs to be charged in order to use it. Another possibility is that the LED light on your camera may also need to be cleaned in order to see the light. However, if the light is broken, the LED light may need to be replaced entirely.
The screen on your camera may not be turning on because the battery in your camera is low and needs to be charged. Another possibility is that your screen is actually on but the brightness setting on your camera is too low for you to be able to see the image. You may also be trying to use the camera at night or in a dark setting and the night vision mode needs to be turned on in order for the camera to pick up clearer images.
Reasons that your camera might not be turning on could include problems with the battery. For example, the battery could be running low or the battery itself may not be getting detected. Another reason is that your charging cable may not be operational and can not charge your camera’s battery. It is also possible that your camera is on but you’ve forgotten to take the lens cap off so it appears the camera is not on.