MacBook Pro doesn't connect to a wpa network.

My MacBook Pro won't connect to the internet when I set my router to have wpa security a posed to wpa2, which was what it was when it was set up.
I Want to set it to wpa because the sony psp won't connect to a wpa2 secured network so It would be great if I could change it so all of my devices could connect with out trouble.
Thanks,

Hi JPait996,
Welcome to Apple Support Communities.
It sounds like your MacBook Pro connects to your Wi-Fi network when it's setup as WPA2 but there is an issue connecting to a WPA network. What happens when your MacBook Pro tries to join the network and does it get a valid IP address? The article below provides lots of great tips that should help you resolve the Wi-Fi connection issue.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Cheers!
-Jason

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