I had recently update my drivers via intel driver update utility on my d54250wyk and my ethernet refused to start after rebooting (code 10 based on device manager). Tried reinstalling and downgrade to previous version but still unable to get it to work. Update bios doesn't seems to work either. I'm using windows 7 64 bit btw. Physically, there are still yellow light emitting out when cable are plugged in. Can someone enlighten me?