This is not a hard fix just one that takes some time. I replaced the drive not once but twice on an iMac 8.1. Whenever I crack the case, I make sure to have some regular clear tape on hand. As I take each screw out I tape it to the side of the Mac, this way I don't wind up getting confused and the screw slots in to the hole much easier.
Makes it easier to keep track of things and easier to put the thing back together.
On my iMac it was really simple and straightforward, remove the screen with suction cups. Remove outer screws. Remove second level (inner) screws. disconnect two cables, rotate the screen so I can get to the guts. Remove the cables to the drive (more screws), gently peel back some tape and unscrew the drive from the caddy.
Replace the drive and pt the things back together.
It sounds formidable but once you’ve replaced any drive in an IMac it is a lot less intimidating cracking the case.
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