The easy solution to fix the missing notification area icons is to restart your computer and if the same behavior still occurs after the restart, then you have to re-enable them from the taskbar properties. Problem description: One or more of the following tray icons Volume, Clock, Power or Network, are suddenly missing from System Tray and when you try to re-enable them from system tray settings, you notice that the corresponding check box for the related system icon is grayed out.
