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HL-R6178W making a loud humming noise

Last response: in Home Theatre
July 24, 2011 5:43:18 PM

our HL-R6178W is making a loud humming noise - it sounds like it is cycling up and down - kind of like when your internal computer hard drive starts to die... anyone have a clue what this is?
July 30, 2011 6:42:42 PM

does it hum when the cable tv is disconnected?
Probably a bad power supply?