I hope some one can tell me whats going on with my pro! When I power down I have a " tone" that starts about 5 seconds after shutdown that goes from a upper register tone down to a low register tone for around a 3 to 4 second time span then has a sound like an old huey helecoter for around 2 sec. Kinda makes you think something inside is bledding off. Should I be worried about this or not? Right now Im real concerned.