jvcGR-D30 digital camera problem

When I turn my video camera on to record it states in the view finder that the lens cap is still on even though it is off. When you turn it on the screen lights up but quickly turns off stating about the lens cap. When turned off the screen lights up blue for a few short seconds then goes off. We can play back videos that have been recorded but can not record anything but sound. We have tried unsuccessful reading the book and trying to figure it out but have had nothing but bad luck. Could you please tell me what the problem is and help me correct it. Thank you!

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