Allow for 45 minutes of cooldown if projector has been in use. Please follow these steps: 1. Turn off the main power source and unplug power cable. 2. Loosen the screws located under the cover of the light bulb with a screwdriver. 3. Loosen the screws that fasten the light bulbs. Hold the handles of both sides of the bulb, take out the screws carefully. 4. Put in the new bulb and fasten the screws that were originally used to hold the light bulb. 5. Fasten the cover of the light bulb below the projector with the original screws 6. Please do not turn on the power before covering the light bulb with the cover because of safety considerations.