blinking light on techwood 4210 plasma when switched on?

when switching tv on from standby, the red light blinks red green etc. when the wires in the tuner box are disconnected and then reconnected this sometimes resolves the problem; and after pressing the power button on the remote several times the screen will come on. Please can anybody help with the resolving of this problem, as not many people will even consider looking at the tuner box, thanks