ClassTech, Troubleshooting, No Internet
Classroom Technologies procedure for troubleshooting network loss on Resident PCs in general assignment classrooms.
3) Check that the ethernet cable is firmly attached to the back of the tower. If loose or disconnected, plug it in. The link light on the front of the tower should be lit up. It looks like three squares set up in a pyramid.
4) Press and hold the power button on the tower until the machine turns off. Then turn it on again and log in.