First post so hope all works ok.
JVC have finally admitted that there is a problem with many of their camcorders going back several years now. Intermittantly the camcorder will not function, the picture is blank or distorted or the viewfinder shows 'Lens Cap' even if the cap is removed. If you have one of the models that this fault relates to you can now get a free repair, including free courier collect and return, even if your camera is outside the 12 month warranty period. You must have the proof of purchase to receive this offer. I have just had mine repaired by this method.
This links directly to JVC's page with full model listing: http://jvc.co.uk/knowledge.php?id=100078