Things You Need To Know Before You Buy Second-Hand MacBook Switching from Windows to Mac and low on budget, in that case buying a refurbished Mac that has tech support and warranty available sounds like a pretty good option. You can also save some good money by purchasing a used Mac.
There are a few steps that should follow to make sure that your Mac doesn't crash the next day of buying itself
Check how old the Mac is: It might be true that the Mac seller claims that the product is in new condition and that might be true as well, but does it mean that the product itself is new? You can check the actual age of the Mac by going to the about this Mac section.
Disable firmware password: Mac users may set various passwords for their devices but one among them all can be a real pain for you if you buy that Mac then you may also be asked to put that password in if you are not aware of the password then you might not be able to unlock the Mac as well.
Check the condition of the display: To check the presence of any defective pixels on the display you can go to the dead pixel checker that can fill the whole screen with pure light and you will be able to spot if there is any dead pixel present in your Mac.
Running a keyboard test: Use the text edit app that is present in the macOS by default and type all the letters on the keyboard to ensure all the keys are working properly, remember to do the same with caps lock as well with your Second Hand Macbook and you are good to seal a deal.