hi joseph,
i would guess that not the Ap is the problem, but the router.
As you receive an ip and a mask the L2 connection between your laptop and your router seems to be ok.
But the question is why does the router only allocate an ip and mask and no dns or gw info.
What happens if you connect a pc directly to the router via a cable? does that work fine?
I dont think there is anything to configure on the Ap regarding dhcp.
If the connection between your laptop and the Ap is established, which is the case as your laptop receives some info from the router, you should be able to access the internet, if you get the right info from the dhcp.
florian