MacBook Pro bot up folder question

My Problem

Thought hard drive and scared to do it myself. Got someone to change had but problem remained. Thought all is lost.

Being electrical engineer opened MacBook myself. Looked at it and narrowed it to cable. Ifixit had pointers to it. Thanks

My Fix

Easy few bolts. It's all modular so remove bolts put new cable. Put it back together and works

My Advice

It's easy to fix itself. Open the box itself and it is not magic inside. It's hardware with logic