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Plenty of manufacturers will sell "bare-bones" systems that have a motherboard preinstalled.
Better overclocking capabilities and the extreme motherboard usually has better speeds and bus over the normal ones.
It's free. It comes preinstalled with any Windows OS.
Every laptop doesn't come preinstalled with Google Chrome. Windows laptops comes with Internet Explorer whereas Mac comes with Safari. Only laptops with Chrome OS called Chromebook have Google Chrome preinstalled.
motherboard cache
Mac Mail or simply Mail comes preinstalled. It is an excellent desktop email program.
With electronics
Put it back into an antistatic bag like the one it comes in originally. And put it into a motherboard box.
There should be a You Tube app that comes preinstalled on every Android device. If you do not have it for some reason, download it for free on Google Play.
Mac Mail or just Mail as Apple refers to it comes preinstalled on all Apple Computers.
preinstalled software
With normal usage a Mac would not normally have motherboard problems. Avoiding immersion in water and not using in extreme hot or cold temperatures will certainly help avoid motherboard problems.