Why won't my Galaxy S5 connect to my iMac?

[AC Question]

Gallaxys5 wont connect to imac

I have two cords. Both the computer and phone are relatively new.
It says the phone will not connect even when I click on the MTP button and my phone says its charging to the IMAC.
The phone says I am connected as as a media device however my mac does not register it when I click on my finder.
I have been trying to connect the phone to the android file transfer program but that is not working either.
What do I do? I'd really like to backup my files to my computer so I can delete them off of my phone. I need more space.

Please Help
Amanda

 

[Kuledawg]

Download Kies and it will install a driver to detect your phone. It's a Samsung program, so you won't get any viruses.