frozen at booting
Exactly what happened:
1. Using my MacBook Pro 13' Retina 2013, I plugged in my SD card to transfer pictures to an external hard drive by dragging and dropping them into the finder window of the external hard drive. It wouldn't allow it to be transfered and said it had an error code -8????? So I tried once more.
2. I got frustrated and decided to work on a different task. I began uploading some movies to my Google drive to watch on my phone. I decided then that I should just restart my laptop in hopes of ever getting the pics off my SD card.
3. I restarted my laptop. It got to the user login page just fine.
4. I typed in my password just fine.
5. The progress bar was well on its way to logging me in.
6. At about 3/4's of the way It stops and shows a spinning wheel signifying a longer wait and then the spinning wheel simply stops and everything is frozen at that point.
7. I hold down the power button and do it all over again and arrive at the se exact point of loading when it freezes again. I try this multiple times with now success of actually finishing the loading bar and being signed in.
How do I get back on to my laptop at this point? I've got a research paper and pics to edit through the software found only on my laptop. Someone please explain what's going on and how to fix it step by step
Thank you!
MacBook Pro (Retina, 13-inch, Late 2013), OS X El Capitan (10.11.1)