Have you installed the motherboard drivers? It is possible that the network adaptor is not working. Can you see the network adaptor in Device Manager. Also from click here 'Some NIC drivers from HP will not install from the downloaded executable. The only thing the SPxxxx.exe does is extract the files in the folder c:\swsetup\SPxxxx
What you have to do is install the driver from device manager, right click the not installed network card and choose to update driver, in the wizard select that you want to install it manually. Then you can select a location,. Browse to the folder where the files were extracted. There it will find the driver and will install it. '