Why won't my wifi work at all?

[lori8265]

I have a galaxy s4 and the wifi wont turn on at all. I looked on here and people have been saying to go to my files/misc/data and find a file and rename it. My phone dosent even have that, I looked. When I pull down my notification bar and I press the wifi all it does is hold by the side says on then turns back off. I've already factory reset on my phone! Please help?