AARRRGGGGGHHHHHHHH. I have posted on here before, but problem keeps coming back. My lovely iMac and its supposedly compatible HP deskjet dont get on. Basically if one of the usb cables get slightly knocked then it freezes my keyboard until I unplug printer USB. Only way I get it working again is to go through a variety of illogical plugging and unplugging of cables and turning on and off of machines. I cant seem to find a simple way of rectifying the problem. Thought I had found one, but this time it wont work. Why does this happen, does anyone know. And because I have had enough and need it for my work I might just buy another printer - anyone recommend one my iMac might mate for life with?