LG Tv has no picture or sound just standby light

LG Tv has no picture or sound just standby light

I have an Lg42lw550t, when i plug the tv into the mains the red standby light comes on the tv and then goes off,,,,Then When i switch the tv on it clicks and the red standby light comes on but then turns to white which will flash once and stay on, but nothing happens just the white light on the standby stays on, no picture or sound.

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