IPad 2 connects to Wi-Fi on iMac, not to internet

I've had this problem off and on since I got the iPad. All of the discussions I can find about connecting the iPad to the Internet via a computer with an Ethernet connection mention doing things to the router. I do not have a router (that I know of). I am connecting my iPad to the Wi-Fi network that was created on my desktop computer (an iMac running Snow Leopard).
The Ethernet connection from the iMac to the Internet works fine (through a DSL modem).
The iPad is wirelessly connected to this Wi-Fi network.
The iPad _used to_ be able to connect to the Internet via the Wi-Fi network, but it can't now and hasn't been able to for a couple of months. This necessitates me spending money using its cellular data connection.
I have re-set, re-booted and all the other recommended things on the iPad.
For a while, the AirPort connection in Settings>Network on the iMac had a 169 dot something self-assigned IP address and could not connect to the Internet. I got smart and reconfigured it so it now has a manually entered IP address and it now says it's connected to the Internet.
But the iPad still won't connect to the Internet via the Wi-Fi network.
So my questions are:
-- is there something I'm not getting here?
-- would upgrading the iMac to Lion help? I have to do that sometime soon anyway.
-- would having a Time Machine help? I've been backing up to a hard drive.

Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
Also try this - Turn Off your iPad. Then turn Off the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
 Cheers, Tom

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Hi carol1920,
If you are having difficulty connecting to your Wi-Fi network with your iPad, you may want to use the troubleshooting steps suggested in this article -
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
Thanks for using Apple Support Communities.
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Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
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On your iPad go to Settings > General > Reset > Reset network settings and see if that enables you to connect.
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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