Macbook must be on battery (no A/C) to access wireless?!?

I have a Macbook (1 year old) and I just got a new wireless router (Linksys). We also have a PC, Xbox 360, and wireless printer, all which work fine with the new router, no problems accessing the internet. Now I know this is gonna sound weird, but my Macbook only loads internet pages when the a/c adapter is unplugged the laptop is running on battery. If I plug in the A/C, (and I have tried diff outlets) then it still says connected but no longer loads any pages. I called the Linksys company and they said that it sounded like an issue with my Mac, and I even went to the Mac "Genius Bar" at the local store and they had no idea why that would happen (Im not even sure they believed me). The old router never had this problem, and I have never had any problems accessing any other wireless internet signals. What is going on with my computer? I do not wish to return the router unless I have to, and I have no intention of paying for tech support. Any other ideas welcome, and thanks for responding.

You might want to have a look at SleepLess…
http://www.versiontracker.com/dyn/moreinfo/macosx/17893

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