Don't spill anything on your Mac. It's no better for the computer than it is for you. If something seems out of whack or if it starts making a funny noise, call the folks in Computer Hardware Services. They can perform anything from first aid to intensive care. Before you start working on an IRC mac you must have your own disk on which to save your work.
Disks are available in the Bookstore.
Turn on the computer. IRC Macs are all iMacs or G3s. In the labs you will see a message that RevRDist is checking to make sure that the Hard Disk is up to date. RevRDist is a program which runs automatically on all the Macs publicly avialable. If someone removes something standard from the Hard Disk, RevRDist will restore the information.