oohhkay - so I am trying desperately to get a summa d60 vinyl cutter hooked up my mac via usb. The problem I am seeming to be having is getting the connection to hold up between the cutter and mac. The instructions (yes I actually read the instructions) say the little led light on my cutter should be blinking when the cutter and computer are corresponding correctly. It blinks about 3 times when I plug the usb cord in and stops. Any help out there??