Satellite L750 turns on and off by itself using Linux

Today I have experienced some strange behaviour on my notebook. It unexpectedly shuts down, after showing a dialog window saying "Your computer will shut down in 60 seconds". And then, when I turn it back on, it just shuts down before booting and it turns back on by itself after a few seconds.
It does not overheat, the CPU temp is normally between 50-60C (I constantly monitor it using Conky). Also, someone told me to upgrade the BIOS, so I did it, but the problem still persists. I have also tried to replace the RAM and run a memcheck, but everything looks fine on the memory side.
I use linux, and had a look on "/var/log/syslog", but I'm not sure I know exactly what to look for. The messages logged before shutting down don't seem to describe anything suspicious.
I use Ubuntu 12.04 LTS, but it seems the problem is more hardware related and I would like to investigate what causes it to shut down so randomly. The same thing happens on Windows, but there's no warning before shutting down.
My notebook is a Toshiba Satellite L750-11w.
Any clues would be highly appreciated.

>I use Ubuntu 12.04 LTS, but it seems the problem is more hardware related and I would like to investigate what causes it to shut down so randomly. The same thing happens on Windows, but there's no warning before shutting down.
You checked the notebook functionality using Windows system but did you use the Toshiba recovery disk and did you test it using factory settings?
Im wondering about the message: your computer will shut down in 60 seconds
If it would be an hardware problem, then the notebook would shut down without any warning messages.
Therefore I assume there must be an software issue I guess some setting triggers this automatic shut down.
But to be honest i have no idea what setting could be
If you think its hardware related problem, I guess only an notebook technician would be able to help you.

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