My mac picks up my home network but will not accept the password

Just got my mac intel and started it up, went through the start up process and it picked up my home network. When I put in the password that works will all other items on the network eg I Phones, printer and playstation, it tells me there was an error with the airport.
Any help please.

Greetings,
What type of router and what type of encryption does it use?
1. Remove the following files to the trash:
Macintosh HD > LIbrary > Preferences > System Configuration >
com.apple.airport.preferences.plist
com.apple.nat.plist
com.apple.network.identification.plist
com.apple.smb.server.plist
NetworkInterfaces.plist
preferences.plist
2. Remove the the saved password for the network:
Open "Keychain Access"
Search the keychain for the name of your wireless network and delete all references to it
3. Shut the computer down entirely
4. Turn off your wireless router for 5 minutes. Usually unplugging the power to the router is how you turn it off.
5. Turn the wireless router back on
6. Turn the computer back on and attempt to join the network and very carefully enter the password for your network.
Hope that helps

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