After I installed Ubuntu 12.10 on my pc my onboard network adapter is not recognized anymore. During the installation and after the first boot everything worked fine. But after a reboot the network adapter isn't recognized anymore.
The pc has dual boot. Even on Windows 7 the card can not be found. I also tried some other Ubuntu and Linux versions. Non of them can find it. dmesg and lspci don't find any ethernet devices and ifconfig only got the loopback device.
My mainboard has a check lan function during boot which should take about 3 to 10 seconds. I activated it but nothing happens so it seems like the adapter is somehow deactivated in hardware.
I got this problem on the same pc some time ago so I don't think that the network adapter is broke. The last time some restarts fixed the problem. This time it won't work this way...
Any suggestions? What additional information do you need? Thanks a lot!