Had the same problem (System powered off, but hardware did not actually turn 
off) on a dell vostro V131.
Problem persisted on installed Ubuntu and Windows 7 as well as Ubuntu and 
Fedora live systems (from USB)
As suggested in this thread: 
http://en.community.dell.com/support-forums/laptop/f/3518/t/19450900.aspx?pi239031352=1
I removed the BIOS battery for a few minutes. This solved the problem for me.

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https://bugs.launchpad.net/bugs/987220

Title:
  [Dell Inspiron 1720] System does not power off reliably when "Shut
  Down" chosen from GUI

Status in The Session Menu:
  Invalid
Status in “gnome-session” package in Ubuntu:
  Invalid
Status in “indicator-session” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Incomplete
Status in “upstart” package in Ubuntu:
  Invalid
Status in “gnome-session” source package in Precise:
  Invalid
Status in “indicator-session” source package in Precise:
  Invalid
Status in “linux” source package in Precise:
  Confirmed
Status in “upstart” source package in Precise:
  Invalid
Status in Debian GNU/Linux:
  New

Bug description:
  Shutting down the computer using the menue does not work always correct. It 
often does not complete turn off the computer. The power LED and the LED of the 
bluetooth unit remain on. Also the fan is still running and won't stop.
  Shutting down the computer with "sudo shutdown -h now" using the terminal 
works fine.

  I am using a Dell Inspiron 1720.

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