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Does anything ever appear on the screen when you try to induce LiveView? or is the screen in question always blank, even when pressing Menu? or after having taken a picture, what shows up?
Do pictures come out, or are they blank/black ?
How old is the camera? in months or years since you bought it.
Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?
Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
Has it ever been subjected to a humidity higher than 85 % or gotten wet ?
Has the camera been operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?