So, I am not sure if this fits on this site, but I don't know any other platform for that. So, I've got an Iphone 6 from my Grandfather, and it doesn't start anymore. It does absolutely nothing, and when I connect it to a Powersource via Cable (dont know how to say that in english) after a few seconds the apple logo shows for half a second and then dissapears, and then the Iphone does nothing again. Do you know how to fix this or where I could look for a solution?