My MacBook Pro's airport has an exclamation point and will not connect to the wifi. How do I fix this?

I have tried restarting my computer, turning on and off the wifi, entering my IP address manually, etc. Nothing is working and I have had this problem for a week now. I know the Internet is not the problem because it works for others in my home.

Open System Preferences/Network
Select the Location you use at home
You may need to click the Padlock bottom left at this point if it's locked, enter the admin password to unlock
In the left hand column drag the Ethernet connection to the top of the list and remove any you don't use
Click the Advanced button bottom right
Click the TCP/IP Tab
Set Configure IPv4 to Using DHCP
Click OK bottom right and you should see the Router IP number appear and a unique but similar one for your Mac
Click Ok then click Apply and close the Panel

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