T420i Fn and ALT keys trigger sleep or shutdown

Hello,
I need help with my T420i, that started to become weird few weeks ago.
symptoms : it shuts down or enters sleep mode while working. First i thought it was somehow random, but then i've reliazed that it happened when i typed Fn or CTRL+ALT key combinations. It first happened while using ubuntu installed in dual boot, but it appears to behave the same under win7.
Diagnosis and repairs trials :
> with a linux live distrib : same behaviour
> using ultimate boot cd : memory check, hdd check, video memory check, with no issue
> formatted the disk and installed debian from zero : same behaviour once installed
> wiped the disk using UBCD (partmagic), and re-installed everything from the initial recovery dvds -> back to original win7 installation
> updated all the drivers and softwares, flashed the bios to new version.
> Tried with an external keyboard : no issue
> Unmounted the keyboard, checked the connector, and made tests with keyboard unmounted, in order to assess whether it could be due to a short-circuit between the keyboard cable and the mother board or the roll cage : no effect.
I suspect a hard problem with the keyboard itself, but is there any other tests i could have forgotten, remaining options to explore ?
If you believe it is actually the keyboard that needs to be replaced, how should i do to have my computer repaired, or to be sent a new keyboard, since it is still under warranty?
thanks for the ideas and suggestions !
Arnaud.

Well, sort of.
I found a setting on my LMS that plays in full screen mode, which solved the problem.

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