2010 mbp SSD OSX Install Problems

I’m working on replacing the hdd on my friend’s 2010 or 2011 13” mbp- it still has an optical drive. It began when the laptop had trouble booting, sometimes it would hang on the progress bar when booting, other times it would boot and he could log in, but Finder would consistently crash rendering it unusable. He took it into an Apple store and they ran a hardware test and said he should think about backing the drive up if possible and replacing, but everything else tested fine.

He...

2010 mbp SSD OSX Install Problems