Satelltie M40X: Lan card disappears from device manager

I have a Satellite M40X with Windows XP SP2 and my Lan Card (Realtek gigabit) is no longer seen by Windows (or Linux : test done with a Ubuntu live CD).
The lan card is not seen by Toshiba HW Setup either. I has disappeared 2 days ago, was back yesterday an d is not present today...
LAN card is activated in BIOS.
Can somebody help me to solve this issue ?
The PC is 13 months old (out of Toshiba guaranty....)

Either some registry keys are damage and therefore the LAN card is not visible in device manager (very impossible) or the LAN card is damage (more possible)
I think you should try to reinstall the OS. If after the new installation the LAN card is not visible in the device manager (as unknown device or as LAN card) so its a hardware malfunction and in my opinion only a replacement or reparation will help.

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