Starting with Windows 8 and Microsoft Server 2012, Microsoft removed the Shortcuts for Shutdown, Restart, Control Panel, and the Startup Menu.
Here are some useful shortcuts to get to all this and more.
If you press WINDOWS KEY + X, this will bring a menu were the START button used to be, with shortcuts to all the missing buttons.
Also you can press WINDOWS KEY + I, and this will bring up the left hand side menu with shortcuts for Control Panel and for Shutdown, Power Off, and Restart.
Large MS keyboard
If you want to get to the STARTUP menu to add items you would like for Windows to load at startup, the easiest way is to do this through the RUN box.
Instructions for accessing the STARTUP Menu on Windows 8 and Microsoft Server 2012.
1: Press WINDOWS KEY +R, this will bring up the RUN dialog box.
2: Type into the RUN dialog box SHELL:STARTUP
Once you press enter is will automatially open the entire folder to the STARTUP folder, the very same you had on all versions of Windows up to but not including Windows 8.
You can then paste shortcuts into the box.