20 - 30 minuten
I had taken my macbook with me on a trip to Scotland and it worked fine all the time there. But when I got back, it would not start up, all I got was the flashing file folder with the question mark on it. I tried all the usual fixes but nothing worked. After making a start-up disk on a flash drive, the computer started up but could not see the HD. I removed the HD and connected it with an external USB cable and it booted up just fine, showing that it was the SATA cable that had failed as was mentioned on this site and others. I ordered a new cable and installed it.
It was straightforward, although tricky with the screws being so small. It takes a lot of care and patience and I suggest using some sort of magnifying device and lots of light.
Overall the actual installation took about 30 mins.
After putting the HD back in its slot, the computer started up and now runs just fine.
It is an easy and economical fix, and I would recommend anyone to give it a shot. Just get organized, several different containers to put the screws in and get a good set of miniature screwdrivers.
All in all the videos really helped to show how it is done.