I'm not sure why you are not seeing the option in the boot menu. I noticed on the Dell support site that they have recently posted a new system BIOS (12/2/2010) and AMT HECI driver package 11/19/2010 marked "urgent" (look on the Dell Drivers and Downloads page for the E4310, then choose Chipset, then choose Intel HECI). It's generally a good idea to update to the latest BIOS and drivers. If the drivers package is installed, you should see a status icon in your Windows sytem tray that will give you details about the status the Intel Management Engine and drivers. If updating the BIOS and drivers fail, ask Dell for help with this.
the "technical" part is (wrongly) solved: it is due to the production process
(read http://www.deliran.net/refrence/Latitude_E4200/E4200_eng/dispatching.htm about similar model).
Now, reading back the file, I dig a bit more:
- the online site dell.com for Optiplex 780 lists the option "system managment mode" with 4 choices (No, Standard, vPro on & vPro off)
- but my French one doesn't show this item.
So now It is a human/commercial problem: why our (before sale) contact at Dell-France writes information about the processor but NOTHING about the option?
Thanks for your help to locate the bug.