The second video of my no bootable fix video hope you understand better in this video,WHAT I'M DOING IS NOT WIPING THE CONNECTION,PLEASE CHECK IF THE TERMINALS ARE NOT PROPERLY FIX OR THE TERMINAL IS DIRTY.FOR MY CASE ITS NOT PROPERLY CONNECTED.. There are many ways to fix the problem,some use keys combination via the keyboard but if all else fails you can try my way of fix,if it does not helps you in any way please bring your device to the qualified technicians for repair.