Although a blue screen could well be caused by a very contaminated video head (which may not respond to a cassette type cleaner and will require wet cleaning) you should be aware that the model you have can suffer from the infamous "lens cap defect", this caused by the image sensor (CCD) originally fitted having the potential to fail. JVC ran a free repair on this for about 3 years or so as thousands of camcorders were affected across a large range of models, including many Sony models as well as the CCD was a Sony brand component which failed, however JVC might still oblige so you should contact the customer services department applicable to wherever you are located. As a test to prove where the fault is try playing and old tape taken from some time ago before the recent problem, if it plays then that 99.9% of the time always indicates the image sensor fault, if it doesnt play then that indicates the possibility of a contaminated head. One further thing is that if when the camcorder is switched on in camera mode ready to take some video and the viewfinder does not show where the lens might be pointing at then thats the CCD fault.