Stuck at boot up screen - Macbook Pro (Early 2011)

Hello!

So I am having some issues with my MBP that I'm hoping you guys will be able to help me with!

Some quick background information on my machine. I switched out my HDD for an SSD and switched out my superdrive for the HDD. It was working fine for the past 6 months or so.

So, yesterday I plugged in my Macbook and started it up from hibernation. I then proceeded to launch chrome and as it tried to restore my last session (with like 5 or 6 YouTube tabs), it crashed. I tried closing it and re-opening it, but no cigar. I then thought to just open safari, but a no network detected warning came up. When trying to resolve that, an "unapproved caller" error came up.

I then tried to restore my computer from a TM backup, but was unable to due to it being unable to unmount the drive, then I tried just erasing the drive, nope.

I then decided to take the dang SSD out of the internal SATA connector and plugged it in through an external enclosure, that worked and I was able to restore my TM backup that way.

So bottom line, I can boot up from USB fine, but when I plug it into the internal SATA connector my MBP gets stuck at the apple logo. I've tried booting into safe mode, resetting the NVRAM and PVRAM. No luck. From what I've seen, it seems that I may have a bad SATA connector that needs to be replaced?

What do you guys think?