My iMac is only a week old and I'm still learning the ropes. I installed my AiO printer yesterday and it seemed to be working O.K. An icon for the printer's on-screen manual was on my desktop so, this morning, I clicked on it so I could learn more about my printer operations. I got a pop-up saying, "the volume of (my printer) manual could not be found, insert the disk." so I re-inserted my printer disk. Nothing happened but I can't remove the disk. Putting the icon on my desktop into the trash doesn't work. What do I do now.