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I assume the projectors are of similar age and have similar useage history? Not certain why they would fail together, but the most probable cause is faulty switch mode power supplies. The electrolytic capacitors in these supplies a relatively short working life, especially when installed in high temperature environments - like a video projector. new caps in the supplies may be all that's required to solve the issue. If you have other similar projectors, they may well be approaching the same problem.
Any reasonably competent TV repair tech should be able to check the supplies for you, and repair them if found faulty :o)
try to replace all the capacitors on the motherboard. This are the only parts that leak in time. Try otherwise to reset to counter or update the firmware on your machine on the infocus site.
I had the same problem and the technician diagnosed as being caused by a faulty Ballast which he said caused the bulb to fail. He didn't test the bulb but his experience indicates that even if the bulb was not blown it would have been stressed and it would only be a short time before it fails completely.
When these fail there is no real reason for it it seems but it has been suggested that a probable cause could be not cleaning the filter, at least every six months. The result of a dirty filter would be overheating and this could be the cause of the failure.
Bulb is definitely not cause of your problem.Normally lamp light will blink when it's defective.Dead means PSU problem .Some projectors have a overheat switch which switches off supply till manualy reset,you need to open the projector.