My MacBook Pro won't connect to my Wi-Fi My Wi-Fi router is provided by BT and works fine for my iPad and Mac mini. However, my MacBook Pro now won't connect to the router but will connect to the external BT hotspot.

When I try to log in it says invalid password. I've removed the router from the list via System Preferences → Network → Advanced but this has had no effect. I've tried adding " before and after the password—now I don't know what to do.
I think you need to scrap the existing Keychain.

Try this:


Go to Spotlight and type in "Keychain Access"
Search for your wireless network in the Keychain Access window
Delete any keys that appear here


Next, while you're at it, I'd recommend trashing your SysConfig folder. To do that:


Go to Finder
In the menu bar, click on Go > Go To Folder
Type in the following location:

/Library/Preferences/

Then scroll to the bottom and drag the SystemConfiguration folder to the trash


Then restart your computer. When it is finished restarting, try reconnecting to your WiFi and enter the password. Let me know if it still does not work!