Switching off your PC before leaving the office each night was once considered a necessity, these days it’s not the case.
Should you turn the computer off or leave it on really depends on how you use it.
If you are using your PC every day for most of the day, or it is set to run scheduled backups then you have to leave it on overnight. Many of us leave the PC switched on because we get impatient with the time it takes to boot up when we need it; setting the computer to go into Standby or Hibernate, this will keep all your settings in place, ready to use again when you wake the PC up.
If you’re still unsure as to whether to turn the computer off or leave it on, answers to these common questions below should help…
Does rebooting the computer each day use more power? NO
Will leaving a computer for long periods cause it to overheat? NO, not unless a fan fails while the PC is switched on. A computer switched on and idle is cooler than a working PC.
Should a laptop be turned off? NO, all of the information above applies to laptop too.
Will turning off the computer cause a power surge? NO
Will turning off the computer harm electrical components? NO, while turning off the computer means that components will cool down and reheat when you switch it back on, this will not harm them. 
Will turning off the computer cause moving parts like the fans to wear down? NO
Will turning my computer off help prevent a power surge? NO, the only way to prevent a power surge is to unplug cables going into the PC lie network, phone and power cables.
Hopefully you have a clearer picture of whether to turn the computer off or leave it on… basically it doesn’t damage your computer whichever option you choose.