watch this 2 min youtube video. the youngman explains exacrly how to fix it. in short u have to open it and press on something in the back. very easy.
http://www.youtube.com/watch?v=NKFFFe0r-T4&ytsession=lk_8pV1bVzShUDIQOufRLvqI6aHPw8PWxBneQGghBW3_5Y3VXzoy_6vHsrHnGbendiH8WS7QqsH5OGbKb9WFN-iVsOy1GPcqial5prNIcpAULy1WIir-kGfv1bSAJm-MpSpUjiInpw0nVjCYPIEX18sqEsRNxdVM07-NzmRo-jqz133mahXRcQM6dlTD7lwoVmgRnqdYbWIAaCAFKrPvTL0n7xjXoAg03qWf1fo0ouVY-xPh9AQ-OaXT6-A55YAoCW3aoThG-Vq3MFMnNagg_3e6vv2fEkV_