1. 1. Enter the teaching building of Jinggangshan University and turn on the multimedia power supply: turn on the main switch of the classroom power supply to supply power to the multimedia system in the multimedia lecture desk.

2. Second, turn on the projector.

3. Finally, turn on the computer: Just press the power button of the computer host, and when the computer enters the desktop for a while, the projector will throw it out of the computer desktop, that is, turn on the multimedia device normally.