Review on Philips Sonicare ProtectiveClean Rechargeable Toothbrush by Rebecca Bright

I last had a Sonicare for over 4 years and it worked perfectly. I bought this one and after 4 months it stopped working. It doesn't matter that the battery is completely fresh after a full 24-hour charge, it makes a high-pitched noise like it's on, but then doesn't vibrate. No vibrations on your teeth, in a cup of water, or in the air. I can even take the head off and it doesn't vibrate. I've tried carefully opening the head, cleaning all the parts it's attached to and still NOTHING. I have an expensive manual toothbrush with a high noise level.