iphone 5c problem

Hello all can anybody help me please i have my iphone 5c i put on charge and sleep when i wakeup in morning my cellphone was dead and when i turn it on apple logo comes and gone again and again same problem then i try home button and power press togther but same i try to connect with itune throw pc but cant only logo comes and go i went tto repair shop he said software problem he did software but same and then he said hardware issue he couldn’t fix. I still have my fone in same condition. Please can somebody tell me how to fix this problem ???????