Here is the problem with used projectors. The bulb could be working but they are usually very expensive to replace. Sometimes the bulb is more expensive than the price of the used projector. I'm not trying to discourage you. I have purchased used projectors and have not had a problem with them. But I did notice that you can reset the bulb hours on the projector at any time. So you really don't know how many hours are actually on a bulb. It's a gamble. But hey, who is out there resetting bulb hours to try and sell a used projector? I have purchased at least three different projectors off eBay and I have been very happy with all of them.