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step 1. Try pressing reset button. step 2 if step 1 does not work. Remove front cover and lamp door press, defeat the safety switch with a screw to hold the lamp door switch in and check to see if the lamp turns on. If it turns on for up to 10 sec then turns off replace thermal fuse.
The Ballast that ignites the Lamp could cause the Lamp to fail and/or cause a buzzing noise. That being said, the Color Wheel in the Optical Block assembly could also cause a similar symptom. If Mitsubishi would be willing to help with the Lamp cost, I would call a local Mitsubishi repair facility to install it and see if the noise is still there and find out exactly what is causing it. Mitsubishi Customer Service Phone number is 1800-332-2119.
I hope this helps,