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#11
I think a lot of people think that when their computer has been shut down the power to it has been switched off. This is just not the case as the PSU is still connected to the mains power & any surging or spiking can easily damage it. In fact a really bad one like a lightning strike near to your power line can also damage the motherboard as well.
After shutting down I always turn the power off to my computer both at the UPS & the main wall switch. I also use a surge protector as well & if the are thunder storms about I unplug the computer & UPS from the wall outlet.