1. Open your System Control Panel.
2. In the System Properties window, select the Hardware tab, then click the Device Manager button.
3. Double-click Network Adapters in the Device Manager window, then double-click the name of the built-in ethernet card (e.g. "Broadcom NetXtreme 57xx Gigabit Controller").
4. In the properties window, select the Power Management tab.
5. Remove the check from the box labeled "Allow the computer to turn off this device to save power."
6. Click OK to close the properties window and close the other windows you have opened.
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