You may just need to re-apply the thermal paste to the GPU, rather than replace the heatsink. The thermal paste transfers the heat from the processor to the heatsink, but it dies out over time and stops functioning properly. Unfortunately the heatsink on those models in on the back of the logic board, so anything you do will require a full disassembly. Because re-appling the thermal paste is not gauranteed to work, you may just want to replace the heatsink at the same time and save yourself the potential of having to do the job twice.
Regarding the CCFL backlight, it is theretically possible to replace, but is extremely difficult. You are probably better off replacing the entire display assembly. If you really want to give it a try, there is a guide on how to do this on iFixit: https://www.ifixit.com/Guide/Removing+CCFL+from+iMac+20in+LCD+CCFL+assembly/5865 Regarding bootcamp, Windows 7 is definitely available in a 32-bit version; I know because I have a copy. However, you may still be able to run 64-bit Windows on that machine. I have a 2006 Mac Pro which also uses a 32-bit EFI and can therfore only run 32-bit Mac OS X, but it is able to run 64-bit Windows via bootcamp. I'm not sure this applies to your machine as well, but it's something to think about. However, I would say that unless you're using windows for 3D gaming, you'll be fine with Paralells or Ware, and in my experience they are a lot easier to deal with than boot camp. -- -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist --- You received this message because you are subscribed to the Google Groups "iMac Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
