Lost wireless access

I have an unusual problem. Have new MBP and has been working on the wireless network fine till three days ago. I have a Linksys Router and two AP's with 4pc's (3 wireless 1 via jacks) 1 Imac, 2 laptops wireless and the new MBP.
The MBP will get on my network but will not take a DHCP or function with a hard IP config. On the MBP, I have under network port configuration unchecked all but the wireless card and still no luck. I have remove and rebuilt the airport and still the same as above.
The Linksys I have set max DHCP to 50. I have the wireless access restricted to MAC address only and no SID broadcast and WPA TKIP.
Any ideas????????????

I'm having the same problem too. Periodicaly the MBP connects to the router (or so it seems) but configures an arbitrary DCHP lease. I have a Netgear router where I have specified to the router to only assign two specific address to the two computer that are hooked, everytime. This problem existed even before I did this, which is what prompted me to do it in the first place.
I think the problem is with the Airport extreme card on the MBP.
As of right this second I'm not able to connect to the internet with my MBP, I'm on my Windows machine.

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