Card Locked?

Hi,
I own a Hitachi HDC-1296E.
Hi,
I am unable to take photos due to the memory card being locked?
I have removed it from the unit and ensured the lever is off.....but still no success.
I have transferrred a succesfully working casrd into my camera....but without success.
The card from my camera works succesfully in another camera.
It appears the camera is the problem, not the card.
I look forward to hearing from you.
Kind regards
Mario.