Dear Mac users, This is the closest forum I thought to inquire about a printer error message which reads: "print cartridges !" "refer to printer documentation" Not wanting to be, as my appliance-repair friends call it, a "parts monkey" I dont want to spend $55 on 2 new cartridges just to find out that wasnt the problem. So far as I recall, the cartridges both had ink in them. Is there any way you know to 'shake up' the cartridges to get them working again? Any other ideas. And where might I find the 'printer documentation'? I was given this unit and have no manual for it. Thanks for your help