ninthtoe wrote:
I have an Infocus LP400. It either works perfectly or fails to light
the lamp. Unable to determine whether it is the day of the week or
just it's mood that affects it. Have tried getting it going with data
signals and checking the lamp is firmly seated. Any advice welcome
thanks

Send it to Infocus for repair if they will still touch it.
Honestly, you are not going to be able to get any parts or service
information out of them for the unit. It could be a bad lamp, bad
ballast, bad main power supply, or a control signal problem.