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Yes, it can be replaced; but Dell replacement parts are very hard to find. Also, it is tricky to open the equipment and not damage any other parts during the process. If you don't work on electronic equipment, I would take it in for service. Other suggestions on the web say to buy a used one for replacement parts if you want to do the work, because they cannot find service manuals or parts - except for bulbs. The color wheel for my Toshiba was $160, and the lamp was bad at the same time.
The clicking noise is the protection switch that keep shutting down the unit. This happens when an internal fault had been detected.
Do the following:
Unplug the unit from power for some time. Remove the bulp and refit it in place. Restart the unit.
If still in protect mode (clicking , lamp light and no start), then there is a fault. When the problem is the lamp, the lamp light will come on, but usually protection does not click. Before buying a new lamp that is expensive, have the projector checked, testing with particular attention the high voltage board that will supply power to the lamp. That may be the fault. If you have a replacement lamp in storage replace the lamp first.
I have 2200MP projector that when you turn it on,it clicks about 8 to 10 times and then the power seams to turn on, but the lamp light light comes on and nothing lights up. it will shut down after that, with the green light still flashing. What could be the problem? Roger