Can I put startup sound in Manjaro? Like Windows XP/Vista/7.
Yes, but the way to do it depends on the desktop environment.
In KDE it is in
System Settings -> Notifications -> Applications: Configure... button -> Plasma Workspace -> Configure Events button and from there you can add sounds to Login / Logout or whatever you want. It actually has by default some sounds configured, but Manjaro doesn’t ship with the Oxygen sound pack