So I went to use my 512ke today, but the keyboard doesn't seem to want to work. I've restarted the Mac, unplugged the keyboard and re plugged it in, blew air into the keyboard plug port on both ends, and wiped off the pins of the keyboard cable. It worked the last time I turned it on. It's been unplugged since then, and that was a few months ago. Any ideas as to why this is happening or how to fix it?