"Turn Off Machine" button doesn't turn off the machine

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Just installed Acronis Backup 11.5.
When (Windows) machine starts, before Windows starts, I get the "press F11 for Acronis", which I do. It launches Acronis and gives me "Acronis Backup" with two options: Acronis Backup and "Continue OS booting". There's also a button in the bottom left which says "Turn Off Machine". This button doesn't work (sometimes I get a bleep when I click it). What do I need to do to get this button to work?!

Motherboard Manufacturer MSI
Model H61M-P31/W8 (MS-7788) (SOCKET 0)

BIOS Brand American Megatrends Inc.
Version V3.6 Date 29/09/2013

CPU: Intel Core i3 3240 @ 3.40GHz

mer 28/05/2014 - 23:38
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It's a known issue - this button works using (rather old) Advanced Power Management interface, and modern BIOSes don't support it. Supporting ACPI there to make it work would require significant efforts.

jeu 29/05/2014 - 08:27
truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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OK, thanks for that. Useful to know.
Except for the fact that, as I've just created bootable media (DVD), after the bootable media has loaded, it gives me a windows titled "Acronis Bootable Agent" followed by

You can manage this machine remotely or locally...
Manage this machine locally...
Host name
IP address
You can tunr on MouseKeys to control the mouse point using the numeric keypiad..

and in the bottom right, two buttons
Turn Off
Reboot
and the Turn Off button does exactly what it says it does.

So why does the bootable media "Turn off" button work, and "Turn off Machine" button on the installed F11 "Startup Recovery Manager not work....?

sam 31/05/2014 - 20:16
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Because when the Bootable Agent dialog is shown, we are already booted into (fully-functional) Linux environment, and we can shutdown or reboot it just like a "normal" Linux OS using its system calls. The bootmenu (with 'continue OS booting' line) screen is a real-mode code executed before any OS is loaded. APM API is available there by simple BIOS function calls, ACPI is not.

dim 01/06/2014 - 05:51