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I have actually seen some of these cases.

In all these cases, Apple denied warranty because, even though the devices continued to function, the devices were not repaired/serviced properly (ie. missing screws, screws in the wrong places, missing parts, etc.).

I understand that. But who is in the best position, and who is going to make that determinaton? Do you think a court will let the customer decide if he did damage? The fact is that BOTH sides have self-serving interests there. Don't you think people should be prepared to get into a battle with Apple on this, instead of just walking in and expecting Apple to do the work without question "because that's the law"? That's why this is not the simple legal issue you make it out to be.
 
I understand that. But who is in the best position, and who is going to make that determinaton? Do you think a court will let the customer decide if he did damage? The fact is that BOTH sides have self-serving interests there. Don't you think people should be prepared to get into a battle with Apple on this, instead of just walking in and expecting Apple to do the work without question "because that's the law"? That's why this is not the simple legal issue you make it out to be.

If the Mac was repaired/serviced properly (ie. no missing screws, dislocated screws, missing parts, etc.), then it's not a problem.

If the Mac not repaired/serviced properly (ie. missing screws, dislocated screws, missing parts, etc.), then it's gets tricky: Apple could claim that improper repair/servicing caused the device to malfunction and hence voiding the warranty.
 
You won't get the money back. It is now seven years old, very dodgy graphics and USB2 are all against it.
Seven years old is nothing for a Mac and an upgrade would be well worth it be it an SSD, Seagate Hybrid Drive or High Performance Western Digital Black Hard Drive
https://www.seagate.com/gb/en/solutions/solid-state-hybrid/
https://www.wdc.com/products/internal-storage/wd-black-desktop.html
https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2429+Hard+Drive+Replacement/7555
 
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