Samsung dlp tv HL-r5067W (by 2 users)

I have had my tv for about three years, the picture started to pulse dark then light dark red,, and no more. I read that it must be the bulb. I put
in the bulb and there is a loud humming noise from within the tv, it is not
the fan,, and the bulb will not light. I checked all of the connections and they are not disconnected,, the front three lights are lite and when i fire up the tv, (i am holding down the blue switch) the lamp light comes on and the humming sound starts. I thought it might be a wire hitting the exhaust fan
but it is not... is this a ballast? or something else?

samsung was no help..