Internet gone after Comcast outage

Hi to all and thanks in advance.
We had a comcast internet outage. My Airport extreme worked great prior to this.
Wireless connection occured after comcast signal came back. But "server not found". Did usual power recycling. No Go. So I did the long delayed airport extreme firmware updates I was afraid to do as everything was working fine. Re-did the airport extreme set up. Works find with no security settings. When I set up WEP with 13 digit password as before, I get wireless connection but no internet. I manually connected to wireless and correctly key'd in same 13 digit WEP key. I get radio connection but no internet. Worked before outage, not after. Again, wireless access is fine with no WEP and with direct cable connection. But not with WEP. Any idea's? My iPhone will not be happy!!

Problem seems fixed. I was trying to use WEP (and was previously using before outage) as I read older XP computers could not use WPA personal with Airport Extreme.
I switched to WPA personal and entered 13 digit password. Seems to be working for the moment.
Geez, this wireless stuff not simple!

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