Ouch, you might have nuked the hard drive. Isn't that tool just a big circular magnet? Best of luck, hopefully you just blew a fuse, try plugging it in somewhere else and hooking it up to a different monitor.
I used the software application in system prefrences and after I clicked the button the whole thing powered off like someone unplugged. Now it wont even start up like it isnt plugged in or something. (of course it is plugged in) I am prettty sure it is dead. I just hope my bosses dont mind too much