Answer to "Can I upgrade CPU from i5 to i7"New SSD drive and put the operating system on it with a new fresh clean install.
Answer to "Can the stand be removed to add arm mount?"They do sell the 2012 iMacs with the vesa mount already attached through the online store.
Answer to "iMac 27" HDD swap recipe"UPDATE! 3 days ago I changed my '''1TB western digital cavier Black hard drive on my 27" 2.8GHz I7 iMac to a 2TB western digital cavier Black hard drive. With the instructions listed here in the site it was actually pretty easy to do. You must take care when pulling and re-installing wires. I almost found out the hard way but all is good. On to the fix; I installed the 2TB hard drive and put the display back on with 2 screws and tested. everything went well and the computer booted. I installed the new system and ran the hardware test, it failed and the fans started blowing. I looked at the instructions and double checked everything. I found that I put the thermal cable on the wrong side. The instructions stated to put the cable closes to the sata cables. I did that and put the screen back on with 2 screws and booted the system. I ran the hardware test again and failed. I tried zapping the pram-zram-bram the whole alphabet ram, and nothing worked. I must have tried the hardware test 4 times after doing some tr...