How can I check that all the parts in a Mac mini late 2014 are genuine or not?
I have found that we can change the About this Mac details from system.
How can I know that Details shown in About this Mac is right and not a cheat?
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There is only four components that can be interchanged in the 2014 Mac mini:
Other than those four items (maybe the modular power supply, but it’s proprietary to Apple) everything is physically integrated into the logic board.
Of the four items I listed, none are “genuine” Apple to begin with
Modifying System Report.
Can you modify the System Report? Technically yes, you can.
For instance, by editing
~/Library/Preferences/com.apple.SystemProfiler.plist with a utility like TextWrangler, I can change the "About This Mac" model info.
But again why? Of the components I listed, none are genuine Apple and the fan doesn’t even report. If the memory was user serviceable like previous models, you could add any compatible 3rd party memory. The memory today, like back then isn’t made by Apple so System Report info here would be moot.
As for the Model or even the CPU info, that info can be easily cross checked:
sysctl. See this answer for more details.
Keep in mind that the SN# is printed on the back or bottom of Mac products. Even if "About this Mac" information were to be spoofed, it's very easy to use another avenue to verify what you have.
It's not possible for someone to make the Mac show different information in About This Mac or System Information from the actual data that the OS reports.
Of course, if you're looking at a photo/screenshot, it could have been digitally altered, or it could be from another computer.
However, a 2014 Mini does not really have many interchangeable parts that could be swapped for "non-genuine" (i.e. not-Apple OEM) parts. The RAM is soldered to the logic board, for starters.
If you are buying something on eBay or similar, then usually you can return it if it does not meet the agreed specification, and get a refund.