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Hello, turn on the projector then press both the up and down volume buttons on the projector and hold them in for 10 seconds. The lamp maximum lamp timer time has been exceeded. This procedure will reset it and you will be good to go.
You were right about the shut-down time. We had an older InFocus projector at work that had the cord yanked (by the presenter no less...) which cost us a near $400 in repairs. A LOT of heat is generated in these machines and proper cooling is absolutely essential to their operation.
it is the power supply/ballast. when you first turn it on, the caps on the ps/bal charge then discharge when the lamp is to strike. if the caps are dried out (from excessive heat), it takes a while to build a charge. so the power drain from striking the lamp brings the ps/bal into shutdown. after you try again, the caps are now up to full power and everything is fine. but every time you unplug it, you'll have the same problem. replace the power supply and ballast.