MacBook HD not mounted

Hello, I'm some desperately need the help.

I have a Macbook Pro 15.4 (2013) inches. It has 4 GB memory and 500 GB of storage. I'm under El Capitan.

I was cleaning my computer today, remove applications and files, and I downloaded OnyX which is supposed to help me clean up the stuff I can't seem to easily. However, when I started it, it says that my drive should be repaired, so I pressed command-R while I reset the Mac. Utility of disc came and I went to fix my drive hard when I noticed that I could not click the button indicating first aid. I noticed that my hard drive has been disassembled, so I looked at a lot of things to try, but nothing has worked. I tried the PRAM reset SMC reset and a regular reset. I found something online about partitioning but my knowledge of computers is lacking and I don't really know how to go on this issue. Is there a better clearer method to do up my hard drive? Help, please!

Thanks in advance!

Are you unable to restart your Mac normally? Describe what is happening when you try that.

Tags: Notebooks

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