Member Avatar for zillah

http://www.daniweb.com/hardware-and-software/networking/threads/91273

http://www.windowsbbs.com/windows-xp/41521-onboard-lan-network-adapter-not-seen-device-manager.html

Dear Experts

I have MotherBoard ASUS P5GC-MX/1333 in the link below :

Every thing was working fine (XP Prof SP3) till my mate upgraded the BOIS after that Onboard LAN Adapter got missing from the Device Manager and the LAN icon got missing from my "Network Place".

I did a fresh installation of windows still the same problem is going on, then I realized the problem with BOIS.

I have checked BOIS and I enabled every thing that I would have thought is related to onboard LAN but still no joy.

What should I do to rectify the problem

Thanks

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Dani AI

Generated

Good start in the thread — (drivers/virus), (diagnostics) and (test card elsewhere) covered the obvious checks. The pattern (NIC present before a BIOS flash, gone afterward) points to either a BIOS/firmware change that stops the onboard controller from being initialized, a corrupted flash, or a hardware failure. The following is a concise, prioritized checklist and quick tests that complement existing replies.

  • Quick physical check: power the PC and inspect the LAN port LEDs. A steady/link or blinking/activity LED usually means the PHY is powered and the NIC hardware is still present; no LEDs increases the chance of a firmware/hardware fault.
  • Reset CMOS to defaults (record any custom BIOS settings first): power down, unplug, discharge, remove the coin cell for ~60s or use the motherboard CLR_CMOS jumper per the manual, then boot and "Load Optimized/Setup Defaults." After that, verify any "Onboard LAN", "LAN Controller", "Network Stack / PXE" or similar options are enabled.
  • Reflash or roll back BIOS: a corrupted flash can remove initialization code. Reflash the same BIOS version or restore the previous known-good version using the vendor tool (follow vendor instructions carefully).

Check OS-level enumeration before concluding hardware dead:

  • In Windows: Device Manager → View → Show hidden devices; Action → Scan for hardware changes; check "Other devices" for unknown adapters. Run:
    ipconfig /all
getmac
wmic nic get name,index,netenabled,MACAddress
  • From a Linux live USB (non-destructive hardware check):
    lspci | grep -i ethernet
ip link
dmesg | grep -i eth

Also install/repair chipset drivers first, then the NIC driver from the vendor (chipset drivers influence device enumeration). If the NIC never shows up in any OS and a separate PCI/USB NIC works, the onboard controller is likely dead; if the onboard controller is discovered in Linux but not Windows, focus on drivers/registry. If uncertainty remains after these steps, roll back the BIOS or contact the motherboard vendor for guidance/RMA. These steps build on the earlier suggestions by , and and aim to separate firmware, OS and hardware causes.

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Member Avatar for jingda

update all drivers and do a virus scan first.

Member Avatar for rubberman

What jingda said, but you might also want to run a diagnostic on the system to see whether or not the lan adapter has died.

Member Avatar for ComputerNetwork

Some possible options:
1- Test the Network card in other computer. If it’s working update the Bios again and reinstall the Network card updating the network drive as well. It should work. When reinstalling the Network card, please try as well a slot that was being used.
2- If card is damaged, replace it
Computer Networks IT

Edited by Narue because: Snipped fake signature
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