I hooked up the printer, scanner, and web-cam in the middle of a boot, and
then I started gettting a " du dum " noise when it comes out of " low-power"
mode, or " stand-by " mode. When the monitor goes blank after 20 mins,
coming back out after moving the mouse, it makes the noises, " do dumm". I
know something is an amiss.
What is the problem?
Why would you hook that stuff up in the middle of a boot? It doesn't
matter really though.
Identify the sound from Control Panel and there will be no guessing
about what it might be, then you can determine what it is exactly, and
what to do about it if you don't like it. At least you will
understand it.
Click Start, Settings, Control Panel, Sounds and Audio Devices, the
Sounds tab.
Sounds like it might be Device Connect or Device Disconnect. Play
those sounds from Control Panel, if that is what you are hearing, it
is normal when connecting disconnecting some USB devices. Unplug and
replug your devices and associate them with the settings you see and
the sounds you play manually.
If you are coming out of Stand By, Windows will make some noises by
default. It is working as designed and nothing is amiss. If you
don't like it, change it.
If you don't care for the way Windows handles such events, change
them, but at least you will understand them.