WRT54G - cannot acquire network address

Hi All,
I having a particularly difficult problem I have not been able to solve. I've searched linksys forums, compaq forums, and google in general. Here are the particulars:
EQUIPMENT:
Linksys WRT54G Ver 3 router
Compaq Presario V2000 laptop
with Broadcom 802.11b/g WLAN (built-in)
PROBLEM:
When attempting to connect wireless to the 54G v3, an IP is never successfully acquired from the DHCP. It fails during the "acquiring network address" phase, and returns with "limited or no connectivity". IP acquisition failure is confirmed with an IPconfig address of 169.254.x.x (APIPA).
CONFIGURATION:
1. this is a new installation (laptop & router are clean, out-of-box)
2. Vanilla parameters on WRT54G (no security, etc.)
3. Upgrade firmware (on 54G), run factory reset to default parameters, assigned a SSID = sully
THINGS TRIED:
1. Compaq works FINE when connected wireless to another router (54G ver 2).
2. A different laptop (Dell) works fine with the Ver 3 router (wireless).
3. Wired connection works fine with Compaq to Ver 3 router.
4. Upgraded firmware on 54G ver 3 to current.
5. Download & re-install broadcom drivers from Compaq (which are actually OLDER than the ones originally on the machine)
6. Tried adjusting beacon, fragmentation & RTS as per a posting elswhere on this site.
7. Tried MS patch KB884020, as per a posting elsewhere on this site (and have since backed it out).
8. Tried resetting the TCP/IP stack as per MS KB299357 & KB811259.
I'm stumped and apparently so are all the standard tech support channels.
Any Ideas?
PLEASE (I don't mean to be arrogant - just frustrated with inadequate/incompetent support) - don't send me the "canned" newbie "try this" responses. EVERYTHING has been tried and this simply makes no sense. I appears to me to be a problem specific to compaq/broadcom & linksys 54G ver3 and no one wants to take ownership of the problem.

I have exactly the same problem with same laptop Compaq Presario V2000 with the same network adapter, although I'm using a different router BEFW11S4. I was able to get connection by using an static IP and DNS address, however I can't go online. Tech support hasn't been able to help me so I wanted to know if you were able to get a solution to your problem.
By the way, I can use my laptop with a Netgear router and I don't get this problem.
Thanks

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The type of connection to the Internet : ADSL2
The Brand of Modem and its Model Number the router is connected to.Linksys ADSL WAG120N
The Method of connection your problem computer has to the Router: Wireless.
The Connection in use on the problem computer: TP-Link TL-WN350GD
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Hi guys,
I initially asked this question elsewhere because it was happening in OSX as well, though now that the OSX side of things has been fixed it is purely a Windows XP problem, and is a different problem to the one in Mac OSX.
The problem seems simple enough, in that Windows XP just refuses to acquire a network address when connecting to the internet whether wired or wirelessly. I spent the best part of 7 hours on this on Monday, and after trawling through countless web pages I seemed to establish that there was an error with the AFD Driver (which, as I understand, is one of three required for the DHCP Client service to run). I was on the verge of probably doing something monumentally stupid and trying to repair/replace that driver when in a moment of genius (which should have arrived significantly sooner in the day) I asked my fiancee when the last time was that she could remember the internet working properly. She said it was the day before just after she agreed to install SP3, but the installation failed. So I used System Restore and rolled the system back to before that point, et voila. Everything was fine.
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