No more Wifi from my iMac after switching to Lion

Hello.
I just switched my iMac 24 from 10.6.8 to 10.7.3 with the latest updates.
My iMac is connected to the Internet using an Ethernet cable. The Internet connection works fine.
I used to use my iMac as a Wifi router so that my iphone and my air can use it to access the internet.
Since I've switched to Lion on my Mac (and not my air), both my iphone and my air cannot connect to the iMac.
I've told both my iphone and air to "forget" about my iMac previous details and rebooted both of them - result FAILED
I've removed the Wifi setting by clicking on on the iMac preferences and restart a fresh one ; I've tried to connect using my iphone and air - FAILED

Just removed the Wifi from Networks. Recreated a Wifi Network. Went to Sharing and Internet Sharing. Renamed the Wifi Name - SUCCESS !!!!!
So, even if you remove the old Wifi connections, rename them.
(I think that's a bug).

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