By the time their life comes to a close, your Mac will either be obsolete and useless to you, or one of the other components (that has a shorter life) would have already given out. Although the LEDs in your Mac's display will wear out eventually if used constantly, their incredibly long life ( 13+ years if used for 10 hrs per day in mild conditions) will far exceed the life of the rest of the computer.

And don't worry about the warning below the Display Sleep slider in the system preferences saying 'Never letting your display go to sleep may shorten its life'. Your Mac will now only go to sleep if you manually sleep it (or shut the lid if it's a laptop). To do this open the system preferences, click on the 'Energy saver' panel and drag the 'Display sleep' slider all the way across to 'never' (on the right-hand side).

The first way to stop your Mac from going to sleep by itself is obviously to turn off auto display-sleep in the system preferences. While it can be handy to have your Mac sleep after a set amount of time, there are certain situations where you don't want it to fall asleep by itself - Like when you're watching a long video, or when you're downloading a large file and want to be able to see it's progress. It is incredibly annoying having to swipe your finger across your Mac's trackpad every thirty seconds when the screen dims, so this article has been written to show you how to stop your Mac from falling asleep when you don't want it to.

How to make mac sleep timer