iPHONE 6

disabled touchscreen ,only switch at right side of unit respond however appeared only BLACK screen and WHITE Apple. I picked one of instruction to fix problem connect to Mac MINI. Through the settion

however only could se Hello,,,, in different languages, as only once appeared on -off sign on top of the screen I did touch screen but did not. work and no changes. It was only once, after that sign

iPhone start with Black screen and white Apple only!

Is this phone still be able to fix? Please help me. Thank you.