Default [Q] Huawei Mediapad S7-301u

I have a roote media pad and i had installed cynogenmod 10.2 and it worked for 1 week and then it didn't want to start then i tyed to install cm 10.2 again and no it installed but when it starts for 10 seconds and it then shuts down. Does someone now whats wrong and tyed other rome but its the same.