Ripped the hard drive cable
Tore the cable when I was updating the HDD to an SSD.
Thanks to your site for the excellent tutorial WITH pictures for step by step instruction on how to replace the part correctly.
I've built dozens of PC over the years, MacBook pros are very different beast - beatifully engineering inside but also very fragile. Watch and read the steps AND pictures several times before attempting to do any hardware upgrades.
Tri-point Y1 Screwdriver
MacBook Pro 15" Unibody (Mid 2009-Late 2011) Hard Drive Cable