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Check Device Manager to make sure there isn't any Red or Yellow signs on your Network Card.
On occassion we have issues with some of our machines at work where the network card drivers become corrupt. If we go into Device manger and either remove the device or update the driver, then reboot, it seems to fix the problem. This basically just reloads the drivers.
But make sure you do the simple stuff first. Try a different cable or test the cable on another machine. If you are connected into a switch or router, try plugging into a different port. I have seen ports go dead on switches.
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