DHCP Not working properly

I've got an issue that has got me absolutely stumped. I'm hoping that
someone can offer some advice.

Here's the network structure:
Cable Modem
Linksys wired Router (BEFS81)
Linksys wired 16 port switch
NetGear Wireless Access Point
Windows SBS Standard running on a Dell server with one NIC
3 Desktop Workstations running Windows XP SP2 (wired network connections)
1 Wireless Notebook PC running Windows XP SP2


The organization is housed in a three story building. The server and one PC
are on the lower level.
One PC is on the middle level. One PC and the wireless notebook (along with
the Access Point) are on the top level.

About 3 days ago both machines on the top level of the building (one desktop
& one notebook) stopped connecting with the network. For many months up
until then all was working fine.

I've tested the wiring (the PC and the Access Point are connected to
seperate data jacks on different sides of the room) and it is fine.

These two machines will not pick up a DHCP address from the server.
The other two machines in the building are working fine.
I've rebooted all the machine multiple times and the ones on the lower
levels work fine, the ones on the third floor will not get DHCP. I've set a
static IP address on the third floor desktop PC, and have turned on NetBIOS
over TCP/IP. With this configuration it is connected to the network and
functioning properly. As soon as I set it back to DHCP settings it fails to
acquire an address.
The other two machines are both picking up DHCP addresses successfully (even
if I release & renew)

I've already uninstalled and re-installed DHCP and DNS on the server. This
did not change anything.
I've even moved all data wiring to connections on the 16 port switch so that
the router is only providing internet access, the switch is providing all
network connectivity.

The Windows Firewall is the only firewall on the machines, and it appears to
be configured properly to allow File & Print sharing.

I'm at a loss. I've got the third floor desktop working with a Static IP,
but cannot use that solution for the wireless notebook because is it used at
public hotspots at times so it must be able to pick up a DHCP address.

Any thoughts, advice, or suggestions would be greatly appreciated.
Thanks,
David


.

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