My mac wont connect to my wifi.

My macbookpro wont connect to my wifi, or any wifi for that matter, it used to be able to but then one day it just stopped, sometimes when i log into my acounts i find it connected to my wifi but then it will log out after 2 minutes. It might have been something i did to my mac (unintentionally) because my other computers are fine, does anyone have any suggestions?

Hi thewhiteapple, and a warm welcome to the forums!
See if this helps...
Go to System Preferences
Click Network
Highlight AirPort and click Configure...
Choose “By default, join: Preferred networks”
Select your access point.
Remove your access point with the minus button.
Launch your keychain access in Utilities and delete your access point keychain entry.
Reboot
Go back to the “By default, join:” page and click the plus this time to add your access point. Enter the correct password, save, reboot.

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