I'm running into more and more folk that haven't heard about drivers for the motherboard and network. Tell more. If this work is done, be sure the network chipset on the motherboard (it's not a card) is enabled and try again. Some onboard devices are dead so we slip in a network card, install drivers and re-test.
I have a weird problem with one of my pc's on my network
it refuse to work on the switch, when I connect both of them with cat5e cable the lights on the ethernet ports at the back off the pc and the corresponding port on the switch are off, no blinking, just nothing. However if I connect this particular pc to the router/modem it works!
btw I don't think that it is anything wrong with the switch becase I have connected other devices on it including other pc's without problems.
Switch: D-LINK DGS-1100-08
Router/Modem : Speedport W 724V Type Ci
PC mobo: Gigabyte GA-G41M-ES2L link