monitor makes high pitched sound

Sometimes my monitor makes a very annoying high pitched squeaking sound.  It seems that if I hit it with my hand it will go away for about 15 seconds.  It doesn't always happen though.  What is wrong?  I have a 1.5 year old Panasonic Panasync/Pro P15.
muffin081997Asked:
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waynebConnect With a Mentor Commented:
This is a high voltage transformer or flyback transformer problem and can be very expensive to repair.  Is this monitor under warranty?  Most newer monitors have 3 yrs parts and labor and 5 yrs on the crt.  Contact panasonic and see if they can help you.
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