SSD won't boot internally but works fine when boot externally via USB

Hi everyone,

I have just bought a SSD (Samsung 850 Evo) . However after installation, my Macbook just simply couldn't boot. I have tried a few ways to try to solve this but have failed in doing so. However, my SSD seems to be working fine when i put it in enclosure and I can boot it externally via USB but it doesn't work when I boot it internally.

Here's what happened:

1. I first formatted the drive and used carbon copy to clone my HDD into SSD via an enclosure (USB)
2. I then took out my HDD and installed my SSD into my Macbook
3. I power up my laptop and it booted extremely slow.
4. My MacBook Pro was running at an extremely slow speed after that (it freeze at times and took a long time to run any software and programme)

I then took out the SSD and put my HDD back. Everything was back to normal.
I then formatted/erase my drive again using the enclosure, this time i decide to run a clean Mac OS Sierra installation. Here's the step:

1. I downloaded Sierra on app store and install it in my SSD (externally)
2. I then booted my Macbook Pro using the SSD (externally) and it works fine
3. I then installed it into my Macbook Pro and boot it up with my SSD (this time internally)
4. But all I got is a "No entry/Prohibited" sign.

It's pretty frustrating. The SSD works fine whenever it's in the enclosure but not when I install it into my Macbook Pro. Can anyone here provide any advice or tell me what's the problem? My Macbook Pro is a 13" Early 2011 model and I am running on a Maverick 10.9.5

 

I was thinking that it could be the SATA cable problem as well. But it works fine and everything was back to normal when I installed my old HDD back to my Macbook Pro.

Does that still indicate a Hard Disk Cable failure?

 

How can I check if it's on the latest firmware?

 

So you would suggest to change the hard drive cable as well?

 

Let me try that up and update my progress after that.