No internet in 12.04 or 11.10 neither on wired nor wireless

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http://askubuntu.com – I just installed Kubuntu 12.04 on a new computer with an Asus motherboard containing onboard NIC. The onboard NIC is enabled in BIOS. I don't happen to have a spare network card to test with. The internet connection is via a D-Link router, either wired or wireless via T-Link USB wireless adapter. The internet connection works fine for other computers on the network (2 wired and 1 wireless). I have tried multiple known-good cables and router ports with this computer. I also booting into Kubuntu 11.10 LiveCD to test there as well, same results. This machine will not connect to the internet. On (HowTos)