In 2 days, my replacement 27 inch iMac will be here. I saw IR two times on my iMac and Apple insisted on replacing it. I have not seen it since then, and wondering if it was some sort of a breaking in thing. My iMac has been running 24/7 for 3 weeks and no single other issue. Very tempted to just keep this one...who knows what kind of trouble this next one can bring to my happy home. Thoughts...