Dell 1100mp data projector

This is a very common problem with these projectors. The fans slow and then lock up and the units are out of warrenty. The fan you replace it with must be the exact same as the old one, even though it is the same as a 5$ computer fan. The processor will detect the non-dell fan and shutdown in the same way. I Havent been able to find any replacement fans that will work. I may be interested in buying your broken projector from you if you give up.

Email me at: nalexandrov251[A-T]gmail.com and we might be abe to work something out.

Check fan filters.
sounds like you have an airflow problem.
open up and clean out dust.
or fan failure.
check fans are spinning when pj is switched on.