hello guys.i am experiencing some issue with my z10.my z10 wont turn on.so mobile repair told me that it had motherboard issue.my battery is fine.but when i plug in charger to z10 without battery blackberry logo appears and then a red battery with exclamation appears and then the device shut down.what should I do now.Please Help!!!!blackberry logo appears but without battery and withb battery it wont start and wont show bb logo