When I press the power button, the computer starts just fine, the Windows are loading just fine, then heavy fanning (REALLY loud) is heard for about two seconds and then the computer shuts down. This happens few times in a row, but when the laptop survives the loading, it won't crash in Windows. Also, happens in Ubuntu.
Thinking it's a heat related problem, I cleaned the fan and changed the thermal paste, but the problem persists. I checked the round condensators on the motherboard and they seem fine.
Happens with and without battery or power plugged in. When I measure temperature (openHwMonitor), it's at most 60 during the whole time.
Edit: I cannot get to Windows anymore. I can boot to Ubuntu, but it seems the fan is not turning the whole time. It starts only for the two heavy seconds, but it is silent otherwise the whole time. I also think the fan used to start for a brief moment right after the power button was pressed, but it does not anymore. Edit 2: ok it DOES start sometimes in Ubuntu, but it is not running right before it enters the berserker mode.