Can't connect via Airport -- "connection timeout" error, instead

I've got a MacBook Pro here, which was successfully connected online via Airport, under OS X 10.4.11.
Then I upgraded to Leopard (10.5), and the machine would no longer connect automatically to the router.
OK, I tried manually configuring the wireless connection, but no luck. So, I brought in an old iBook G4 running the same OS (10.5), and successfully linked it to the router, wirelessly, via Airport.
Copying the procedure that worked with the iBook -- to the MBPro -- did not help. Still getting a "connection timeout" error message.
So I performed a fresh install of 10.5 -- and I even DLed the Software Updates, including two that were supposed to improve Airport functionality -- and tried again. No luck.
Any suggestions?
TIA.

John,
I had the same problem when I upgraded from Tiger to Leopard in January. My memory is already rusty but try the following:
1. Go to System Preferences > Network pane. On the left pane, click on AirPort. In the right pane lower right, click Advanced button. Then on the AirPort tab, click on the name of your network and then the minus sign to remove it from the list.
2. Click Apply and quit System Preferences.
3. Put the computer to sleep.
4. Wake the computer.
5. Go back in to Network preferences, AirPort tab. Click the plus sign to add your network. Fill in the Network Name, choose the type of Security by clicking on the pop-down bar, enter password/code/phrase and click Add. NOTE: Do not connect to the network at this time.
6. Click Apply and Quit the Network Preferences.
7. On the Menu row, click the Airport icon and select your network. (IF your network does not show, choose Join Other Network. Fill in the Network Name, choose the type of Security by clicking on the pop-down bar, enter password/code/phrase and click Join.)
8. Verify connectivity
9. Put the computer to sleep.
10. Wake the computer.
11. Verify connectivity
HTH

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    Having spent hours reading about network problems, I think it's safe to say that macs have problems with certain routers. Why a G5 works and a powerbook G4 doesn't is beyond me, but clearly software must play a role.

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