Hello. I am a kindergarten teacher and am having a problem starting my antique Mac computers after a summer of rest. After checking the power source and making sure that all connections were tight, I still get the same error signal. Once it fully boots up a little floppy disk flashes with a question mark in the middle of it. I don't know what this means, as I have no training a Mac computer and my school has no tech support for my computers. Any suggestions? I know that my computers are old and I am prepared for bad news. Any help will bring smiles to 24 eager five year olds!