after having thought about this a little bit, I would like to write down
as much information as I can.

I wrote "randomly" because it really is randomly. This means, the user can not 
determine a reason for these reboots. There is no obvious connection between 
something the user does and the occurence of these nasty reboots. 
This means, that the system could be running for 10 minutes (this was the 
maximum, I managed) or just a few seconds. Sometimes even at Bootup the system 
started over.
In my maximum uptime of 10 minutes, I tried to install the fglrx-updates 
package via this "additional drivers" menu. It downloaded the package and 
installed - and even during the install of this package, when the system was 
busy doing something (I was moving the mouse....) it rebooted, leaving a broken 
system, because fglrx was not installed completely. 

These reboots also happen during install of the system (no previous
operating system present). Mostly it booted up to the menu, where you
can choose to try Ubuntu first or install directly. It showed this menu
and in the next moment, it shut down.

In Bugreport no. 1309578 somebody mentioned in the comments, that moving the 
mouse constantly does the trick to keep the system running until fglrx is 
installed. 
I also tried this, but I don't think that this really makes a difference 
because the system was also shutting down some times, even as I moved the mouse 
constantly.

I installed the system via Ubuntu 12.04.4 because I did not realise that
some bootoption (radeon.dpm=0) also would do it. But I noticed that
12.04.4 started the Live environment much faster than 14.04. Also after
install, the system booted much faster and as I mentioned already, it
did not have the reboot-issue with the radeon driver. At least I did not
experience it.

Now, 14.04.1 is running flawless with fglrx-updates installed.

I am not really sure, whether this report is helpful because all the
data is collected with fglrx-updates installed. But using the radeon
driver really makes the system unuseable.

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https://bugs.launchpad.net/bugs/1372169

Title:
  random reboot with MSI A78M-E45

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