Answer to: What are size and thickness of adhesive tape in iMac?Since the tape has to be custom cut to fit everywhere I highly recommend the ones provided by iFixit. I'm from Sweden but had no problem ordering the US kit online and had it shipped here. If you are still going to try this yourself you will need a good cutting tool like the one provided in the tape-kit iFixit sells. The problem with using your own is that you might accidently input it too deep and damage the internals. A blade knife should to the trick. The tape itself is really thin, though I couldn't say just how thin. I Think either .5 or .6 (that's mm, right?) would to the trick. Remember you need to make some breathing holes and don't forget to carefully remove the old tape from both the screen and the computer. Good luck and let me know if you have any more questions, I took my iMac apart yesterday so I still have it fresh in memory :)
Answer to: Adding an SSD driveI just want to chime in here; I took my iMac apart yesterday to install some new updates; added a new Core i7 3.1GHz CPU and upgraded to 16GB RAM. While I had the machine open I also bought the OWC 240GB SSD meant for the 2012 Retina MacBook Pro in the hopes this would fit. Sadly, while the SSD stick fits perfectly in the slot provided on the motherboard, the computer won't start with the stick installed. I've contacted OWC about the drive but for now it appeares as only Apple branded SSDs will do the trick...
Answer to: Upgrade 2.7GHz (Base model) cpu to i7?I just bought the Intel 3770S (3,1GHz i7) and installed it in my 2,9GHz i5 iMac. The computer wont start. There is a tick when the powerbutton is pushed but nothing else happens. Im gonna reinstall the old i5 again and doublecheck everything but my guess is there is maybe to little juice in it? Then again, Im having a hard time believing they would change that much internal components when moving to the i7.... Update ------------------- I took the computer apart again and found the problem to be one of the new RAM sticks I installed. The computer happily accepted the new i7 CPU, sorry for the info earlier. I can now verify that the Intel 3770S (Core i7 3.1GHz) will work. Be sure to clean the heatsink and apply new thermal paste before reassembly.