My Favorite Guides
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Answer to: info on transferring data prior to replacement?You can follow the instructions at https://support.apple.com/kb/PH20578?vie... You can use the disk itself as the source just as you would a disk image.
Answer to: Can't match Model numberAs Dan notes, you can use your serial number to help identify your Mac. You can do this yourself by entering the serial number into the form on Apple's website at https://selfsolve.apple.com/agreementWar...
Answer to: HD replacement compatibility concernsShort answer: Yes. For example, the 2 TB 3.5" Hard Drive includes your iMac in its list of compatible Macs. The repair guides also usually include a list of both tools and replacement parts that have been vetted.
Answer to: What if LCD is bad but external monitor works?If only the backlight is bad, but everything else works you can shine a flashlight through the Apple Logo on the back of the screen and look for an image on the front.