My computer used to work fine on the network, but it has suddenly lost access to some or all of the facilities.
It is possible that your computer has been discovered to have a virus, has malfunctioned in some way detrimental to the rest of the network, has exceeded the bandwith limit or has been found to be doing something in breach of the various regulations for use of the network. In any of these cases, your room may have been disconnected from the network, so you should check your pigeonhole for an orange 'Notice of Disconnection', which will explain why you have been disconnected as well as giving advice on what to do next.
If you have just moved in to a new room and your computer worked fine in your old room, it is possible that a clerical error has occurred resulting in the network connection in your new room not being set up for your use. If your computer appears to be connected properly and the normal flashing lights, connection messages and/or network icons appear as expected, but you can't make use of any network facilities, this may be the cause. Please contact the Computer Support Office where this condition can be quickly checked for.
Your computer may have developed a hardware fault, or a virus or malware may have infected it and interfered with the networking software. If you believe this to be the case, please disconnect your computer from the network and contact the Computer Support Office for advice. Amongst other things, we have a stock of security CDs which can help in removing virus or malware infections.