when your camcorder says the lens cap is still on even though its not it is often a ccd fault, i have found this on my own camcorder and the repair cost is about £100. you can check the jvc website if it is fairly new as they have a customer notice with a list of models offering free repair.
hope this helps. i dont know if you already new that.
raz
October 2009
i have a jvc gr-d560 and i can switch it on but the lcd screen is black and it keeps telln me to take the lense cap of but it already is of