Just found this on google, it helped me once before,
Right click "My Computer"
Select "Properties"
Go to "Hardware Device"
Click "Device Manager"
Select "Network Adapters"
Select "Marvell Yukon .....PCI-Fast Ethernet Controller--> right click ---properties--->power management-->deselect "Allow the computer to turn off this device to save power"--->Go to "Advanced" tab--->put value off for "Wake from shut down" --->value none for "Wake up capabilities"
lets know if it sorts it, otherwise chek the bios settings,
fingers crossed