If you are prompted phone is in safe mode, you can simply restart the phone to normal. If you still can not quit after the restart, in which case, the system or hardware failure may have resulted. In order to understand and solve specific problems in your phone, you will be sent to the nearest phone Samsung service center for inspection, the service center will determine the phone's specific problems and accessories based on test results. Service center address and contact information please visit: http://support-cn.samsung.com/support/ServiceLocations.asp
Samsung companies know, to provide you with quality solutions, carefully answer your question, hoping to get your satisfaction rating.