Did kismac break my Macbook's Airport card?

Well here's the story... a few days ago I tried to put DD-WRT on my WRT54GV5 router. I thought I bricked it cause i couldn't access the firmware at all but luckily I had a copy of the official linksys one and was able to get that up and running. So for a couple days everything worked fine... wirelessly and otherwise. Then suddenly my new macbook (non pro) which I had previously been using kismac on was not able to connect to the internet with it. Figuring it could be the router, I tried using a linksys USB card I had and it works perfectly. I even went as far as re-formatting and reinstalling OS X to try and replace my airport driver (figuring kismac replaced the default one by mistake), and no success. The only thing I notice now is that it DOES appear my router is leasing the macbook an IP address... but I can't ping the router or otherwise access it from the macbook. Please help