New Macbook won't connect to existing network

Hi there,
I've just got my new macbook, and it won't connect to my wireless network. It comes up with an error message saying it cannot connect to the network. There's no hint of what the problem is. I have another laptop which connects to the network fine. Is it a password issue? And if so where do I go to change the relevant Airport settings?
Thanks
J

The System Preference, Network, is where you change these things. However, it will only ask for a password when you try to connect, and it needs one. If it didn't ask, the network doesn't have a password. If you tried to enter one before, you can try deleting the Keychain that holds the wireless password. Open Keychain Access from the Utilities folder. Look for your network name in the list of items and delete the one with that name. If you have more than one, that may be the issue. Just delete them and start over trying to connect. Otherwise...
We need to know more about the wireless network. Open, WEP, WPA? Type of router? What are the router settings?
What are the MacBook settings for the Airport Network settings? Is it set to join automatic or preferred networks. Try adding your network as a preferred network and try that.
The following are things that may work. Sometimes preference files prevent things like this, even on a new MacBook.
There is also a preference file, /Library/Preferences/System Configuration/com.apple.airport.preferences.plist that controls some of the global Airport items. Try moving it to the desktop and then open system preferences and re-configure the network settings. Also there is preferences.plist. It has all of your network configurations and locations. If you move it, you'll have to add all of your network interfaces back into the Network Port Configurations and any Network Locations you may have made.
You can always move them back if it doesn't help, but you'll have to overwrite the new ones that were created. You must be an admin user to do this.

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