I have a Macbook Pro with Snow Leopard, and a HP Deskjet 2050. When i plug in my printer to the USB port in my mac, around 80% of the time the screenshot below appears, and I can't connect to my mac to print/scan. It's really annoying me because it still works sometimes, but randomly, and once the message comes up, no matter how many times i unplug and plug in different wires it usually won't connect for the next few days. I don't understand why the message keeps appearing, as the printer obviously can work perfectly well as it does every now and then, and i've tried it with and without something else plugged into the other USB port, as well as ensuring my laptop isn't doing much, and is fully charged. I would be really grateful if anyone could help me. Thanks!