HELP MacBook Pro hd unmounting


help please macbooks hd keeps unmounting making unresponsive when try start up!! went disk utility in recovery mode. happens 2 different hard drives.


having trouble , told might graphics card apple techs not confirm after testing - don’t think issue i’m thinking might related other troubles.
 

could tell little more specific system have? example, mid-2012 unibody 13-inch. in cases, such issues can caused problem sata cable, , model mbps known issues them (but not mbps have sata cables because not of them use sata drives.)
 


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