MBP Hard Drive Issue

I work at a university that provides computer repair services to students. Currently, I have two MBP 13" (one a 2012, and one a 2010) model, but both experiencing the same issue. They are not able to boot into OSX, but both have new HDD that have been tested and recongized on Linux and Windows, in addition have passed a Drive Fitness Test. The issue is when these drives are installed in the MBP's, they are not recongized by Disk Utility either of two different OSX install disks. I have reset the PRAM and SMC of both machines, and reseated the SATA connector in both. I am leaning towards SATA cable failure being the cause, but do not have another known functioning one to test with. My question is, what is the chances of the cable failing? I have never heard of a traditional SATA cable failure being a major issue, but just one offs. Also, does anyone have recommendations for purchasing a replacement cable? I have found a few by searching Google, but their prices are over $40. This seems silly for a simply cable.

Thanks for your help in advance!