>I have seen cases where a mobo will spontaneously disable its onboard LAN adapter, or other onboard devices (usually if the CMOS battery is getting low).
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>Event Logs are in Computer Management rather than Control Panel. One way to access them is to right-click on "Computer" or "My Computer" in your start menu (or on the desktop if present), then click on "Manage".
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You can also type 'View Event Logs' in the Start button Search at the bottom and it will open it. I now often just type few letters of the application I need to open.