How to turn off the power on the Windows 7 system

I use my computer almost every time at night, sometimes it is too quiet, I heard the computer's boot tone, I was really shocked. Later, I found a way to close it, and I have a problem with my friends, you can find out.

Specific operation method:

First step, click "& control" in the "Start" dialog box to enter the interface.

Step 2, click “Hardware & Sound" in the "Control Panel" interface.

Step 3, click on <; Sound” in the interface to change the system sound & rdquo;.

The fourth step, in the sound scheme, is set to "silent" and press the "OK" button. In this way, there will be no sound when you turn it on later.