IBook connects to 'net, but MacBook won't

I have an iBook G4 (wife's Mac) and a newer Macbook. Both connect to the 'net via a wireless router (D-link DIR-615). This morning, for no apparent reason, I suddenly was unable to connect to the web on my Macbook. The iBook connects with no problem. I tried restarting the Mac, the cable modem and the router, but that didn't work.
When I run diagnostics, it gives me a 'green light' for Airport, Aiport Settings, and Network Settings, but says the ISP failed. When I plug into the ethernet port from the router, it still doesn't work! The only way I can connect is if I unplug the router altogether and plug in the ethernet directly from the modem to the Macbook. Any tips??

No responses yet, so I'm just adding this info in case it helps someone figure out what my issue might be.
I brought my Mac to work and was able to connect to the wireless network w/ no problem. I'll take it home tonight to see if that someone resolved this mysterious issue, but I'm not counting on it...

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