Hi. First i wont to apologize if this thread is already existing. I am new in the Mac world. Few days ago i read the manual that is shipped with the iMac. There on several places was written when you finish working with the iMac to put it to sleep. Turning off was mentioned only if i want to upgrade the RAM or when i want to moved it somewhere e.t.c. So my question is what is better - turning off or putting it to sleep? Now when i finish working with the Mac i turn it off.