e4300 LAN Issues with BIOS Upgrade

Hello all...
My e4300 LAN no longer works, the typical "Invalid ID" after running diagnostics.
The particulars:
* e4300 Windows 7 Pro, Centrino
* It was working fine, I would turn off WiFi, and the LAN would kick in with good connection...no problems
* I upgraded from A14 BIOS to A26, with steps at A24 and then A26. The drivers section at Dell did not offer anything in between A14 to A24.
* A26 BIOS is working fine, and everything is in order, but my LAN will not connect anymore, WiFi connects fine
* I've downloaded/installed:
Intel 825xx Gigabit Platform LAN Network Device Diagnostics Utility
Intel 825xx Gigabit Platform LAN Network Device Driver
* Both of these have installed with out issues
* I've tried the trick of disconnecting CMOS battery to reset, this did not work either
* I've tried a different cable with out success
* I've used ethernet cable on my other computers and these computers work fine: ASUS Desktop (AMD), ASRock Desktop (i7), Alienware M11xR2 (i7), Latitude e6430 (i7). All these computers work fine with the Ethernet cable.
* I don't know what else to do?
Thanks for the help

 

Looks like it is working! I ran these two commands at the command window, with admin. privileges

1. IPCONFIG /RELEASE
2. IPCONFIG /RENEW
3. Restarted the system, and it works again

 

Thanks for the update. That's one of the problems I haven't seen for a while. Perhaps newer systems are less vulnerable.

John