You are in a conference room where a presenter is attempting to display a presentation from a laptop to a projector. The laptop and projector are both powered on, but the projector continues to display a 'No signal' message. Before checking the physical connections, which of the following should be verified FIRST to resolve this issue?
Switch the laptop to an external display mode using the function keys.
Adjust the laptop's screen resolution settings.
Replace the bulb in the projector as it may be too dim to display an output.
Confirm the projector is set to the correct input source that the laptop is connected to.