Earlier this week I purchased from Amazon a new iMac 27 (sick of waiting to see if there is a refresh), and within 20 minutes of turning the machine on the CPU & ODD fans started spinning full tilt. I've reset SMC & PRAM quite a few times now, and it hasn't helped. When I ran the Apple Diagnostics, it threw a 4sns .... TLOp -- 124 error, which according to the iMac technicians guide (thanks google) indicates that the display link cable may be loose inside. Apple Support spent about 15 minutes with me on the phone, and then scheduled me for a Genius bar appointment to resolve the issue. I've had the computer turned on for 6 hours, 5 1/2 of which were spent trying to fix this issue. Should I simply do an exchange with Amazon, or wait to see what the Genius Bar says? Any solution from the Genius Bar that involves opening the machine is not acceptable, as I'm not going to deal with that on a brand new machine. Otherwise, why did I switch from my home builds?