Bulb replacement (by 2 users)

I have an Acer projector which I recently had to change the bulb in. The problem is that I am still getting the message that the bulb needs to be replaced. Do I need to reset something? And how do I do this? I have checked the manual that came with the projector and it does not explain this. All it says is that the projector senses when the bulb needs to be replaced. The old bulb was replaced by a new bulb.