IPhone can't join network (WPA-PSK)

I have a D-Link DI-524 router and it had always been set to WEP until I bought my Macbook Pro recently. Everything worked fine with WEP - my iphone, playstation 3, old laptop. But my macbook couldn't work with WEP, so I changed my router security setting to "WPA-PSK/WPA-PSK2"(shown as an option on the router setup page). Now my macbook and playstation 3 both work with the new setting, but not the iphone....it can detect the network but when I type in the correct password it says can't join the network. I've tried resetting the iphone network, rebooting it, still not working.
I never got to the bottom of why my macbook can't work with WEP, but as long as it works with WPA that's fine so that I can at least use the web. I'm alright with having to use 3G on my iphone too, but it'll be very inconvenient if I have to download certain apps that require a wifi connection.

Try the steps in the article below:
iOS: Troubleshooting Wi-Fi networks and connections
Another easy way to isolate the cause of the issue is by trying to connect those devices to another wifi network.

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    Try the steps in the article below:
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    Another easy way to isolate the cause of the issue is by trying to connect those devices to another wifi network.

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