I own an ancient LP425Z. It's worked great up until a few weeks ago.
When I power it on, it makes a loud "chirping" sound like it's trying
to ignite, but I get nothing. I called InFocus tech support, and they
suggested buying a new $400 lamp from them. I did. When I first
installed it, it worked...but only once. When I powered on the
projector later that day, I had the same problem. This leads me to
believe that it is in fact not the lamp that is the problem.

I've been searching around for an answer to this problem, but haven't
found anything too helpful. If anyone has any suggestions, I would
appreciate it.

Matt