For some unknown reasons, for ordinary users, developers Win 10 decided that the welcome sound and do not need to include the operating system became fully run without sound. That's just not all users of this innovation and notebook PCs like, because for many years, most of us, accustomed to the fact that we hear at least some noise, when the operating system starts, even if you do not see the monitor, understand that the operating system has booted and you are ready to go. It is clear that there may be other reasons that the user PC needs to listen to the sound triggered by the OS, but it's all individually...
Method number 1
In order to include the welcome sound when you start Windows 10 is not that complicated prodelyvat you do not have to, since audio files are already present in the OS, and you just have to correctly perform their inclusion.
1. Go to the "Classic Control Panel» → «Sound": 
2. Go to the tab "Sounds» → put a tick against the item "Play melody run Windows»: 
Thus, you will be able to include the welcome sound when you start Windows 10 and now, you'll always hear the familiar, and most importantly, you need a melody.
Method number 2
If you for some reason was unable to fix the problem with the sound using the "Method №1», then it is time to start using Windows 10 registry tweak.
1. Open the "Registry Editor" using "the regedit" command → through the left column perehodimo the following path: HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / Windows / CurrentVersion / Authentication / LogonUI / BootAnimation.
In the last subsection find the 32-bit-a DWORD parameter that has a name «DisableStartupSound»: 
2. produce a numerical change of parameter «DisableStartupSound» from 1 to 0 in order to able to include the welcome sound when Windows starts 10, and vice versa, replacing the numerical value from 1 to 0 in order to this very sound disappeared.
That such relatively complex operations, you can always manipulate the sound on and off in OS Win 10, and most importantly, you do not will not deliver any problems!
