Well, you might start collecting paperclips -- to restart your computer, there's a small reset hole next to the ethernet port. Bend a paperclip and use it in the hole to restart the machine. This gets annoying after a while, so you might consider putting some kind of button there, either by making your own (using a push pin or thumb tack) or buying one from www.imacresetbutton.com
. I bought one of their buttons for my rev A iMac -- not cheap ($10), but very useful.