If it is not listed under adapters or unknown, then it is not on ... or not functioning. Check BIOS Setup (F2), Integrated Devices, and make sure that it is enabled. If so, then the NIC has probably failed. You might try clearing the NVRAM using the jumpers on the motherboard. You might also try booting to a "live" CD to see if it works from there before giving up on it. If that doesn't work, then just get yourself a network card.
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