It is pretty common problem.
If all of your DVDs are having same problems,
it is most likely either optical sensor is at fault. The other could be the actual loading mechanism problem.
If the dvd tray(drawer) closes all the way in but the DVD disc never completes the loading(reading) procedures, 1) it could be simply dirty or damaged disc. 2) the optical pickup device (eye) is dirty or just went defective. 3) sometimes the drawer tray that houses the DVD did not complete to engage in disc reading position can produce this result.
I would suggest: first check the position of the drawer and condition(s) of your DVD disc itself.
If the pickup device(optical eye) is dirty or defective, that needs to be serviced by a qualified technician. or contact JVC service center. Their information can be found at
http://support.jvc.com/consumer/support/support.jsp?pageID=10
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