I have a Mac Performa450 that I just recently rehooked up after 1 year of no use. The system boots up fine. I can get into Clarisworks okay, but when I open a blank document, there are a series of '''''''''' that get typed throughout the page. When it finally stops(about half way down the page) I can't type anything no matter how hard I try. Any suggestions on how to get this keyboard working again? Everything seems to be connected okay. I am in dier need of help!!