Refresh rate issue on multiscreen, halp plz

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Hello, 

Thanks in advance for helping and yes i have searched for solutions before posting but i didnt find anything :|

So here's my issue:

I have a MSI Gaming laptop, Dominator GT72 with a 75hz screen. My external screen is a ASUS 27' 60hz screen. Now the issue is that for whatever reason my vanilla wow client "locked" at 75hz and will not run on 60hz, ergo it starts up on the external screen (i can hear the sound + the icon/process start up) but i neither goes into fullscreen nor window mode, i simply do not have access to it on the big screen.

I already opened the config file and added the refresh 60 set command but nothing happened. I even tried the oldschool blizzard approach deleting the WTF folder and still  nothing. I go to options to change Hz ingame and the only option i have is 75.

If any1 has any idea, please lemme know.

P.S. I copied the client from my brothers computer who plays on 60hz... вау me, right?