Enjoy your new iMac and Yosemite. While you are waiting for it to be delivered it would be an opportune time to be sure all and I mean ALL of your applications, kexts, etc. are up to date and make a list of those you will need to update after you are running Yosemite. The most common glitch with Yosemite is out of date software.
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney
