Do I have a faulty SSD or is it a software issue?

[.macbookpro.]

Hello everyone
It's been a while since I last posted about my MacBook Pro. Last month, I bought a 512GB SSD, then I got the battery replaced by Apple.
Today, I try to connect my iPad to my macbook, and it doesn't recognise it. I try to connect my iPhone, same thing. So I turn off my laptop, and when I turn it back on, a 'no entry' sign appear after the progress bar gets to about ¼.
So I disconnect my iPad, and restart it. Same thing. I boot into recovery, my SSD is recognised, it's mounted, and I repair disk. No issues. But it still won't start.
I'm thinking it's going to be a software issue. But I just want to see if anyone else had similar issues?

 

[Bruno09]

Hello,

from the recovery , repair the permissions.

Then, reboot in safe mode (Shift key hold down on chime).

Does it start in safe mode ?

 

[.macbookpro.]

Hello,

from the recovery , repair the permissions.

Then, reboot in safe mode (Shift key hold down on chime).

Does it start in safe mode ?

It doesn't. I'm going to open it up to make sure the SSD is connected properly then I'll try again. If it still doesn't work I'll restore from new

 

[Significant1]

It sounds to me that replacing the battery has caused your pram to be reset. In case you are using Trim-enabler and Yosemite, a pram reset will reenable kext signing requirement. You need to disable that in recovery to proceed. See the description on trim-enabler homepage, about how to do that:
http://www.cindori.org/trim-enabler-and-yosemite/