new lamp causes projector failure?

A teaching colleague and I have a similar problem with our Dell projectors--mine is a 2300MP and his is (I believe) a 2200MP. We bought them with our money but use them extensively in the classroom. Several weeks ago my lamp went out. His had been out for some time, so we ordered replacement lamps.

 

When we replaced our lamps, everything seemed fine for a short time (five or 10 minutes), but then the projector image shut down and we couldn't do anything with our projectors--there is nothing showing, but the fans continue running until we unplug them. It seems like too much of a coincidence that both of us should have the same problem after buying replacement lamps.

 

In one of the old strands that mentions a very similar problem, I see that a Dell moderator says "Get that replaced." Get what replaced? Do I have to replace the brand new lamp, the projector, or what? Obviously I don't want to buy a new projector every time a lamp goes out. HELP!!! Please? I either need to return the lamps and get my money back so that we can buy new projectors, or I need to know how to fix this problem. My projector is an important teaching tool.

 

Randy