Open the start menu using Powershell

Yes, it is possible using a little VB.

Copy this code into Notepad, and save as startmenu.vbs. [Make sure it doesn't get saved as startmenu.vbs.txt]

set wShell=wscript.createobject("wscript.shell")
wShell.sendkeys "^{ESC}"
Set WshShell = Nothing

Then, you can just run it with cscript C:somefilepathstartmenu.vbs.

(Obviously, you'll have to specify the path where you save it to)