I have Sony Vaio VPCF12S1E and it is 3 years old at the moment.
I have two major problems: a black screen and a blue screen. I opened my laptop and cleaned up parts really carefully. I changed the thermal paste and run stress tests: CPU heated up to 75 degrees and GPU up to 57 degrees under 100% load. There were no shutdowns during tests. So I don't think the BSOD and KSOD are related to heat.
Blue screen occurs randomly when I use the laptop. On a regular usage, the screen freezes but sounds keep playing and I can use keyboard to send commands (for example I can send my voice over TeamSpeak or receive others'). After a few seconds of freeze, I get the blue screen.
As for the black screen, again during a normal usage, the screen shuts down but processes keep executing for a few more seconds (like maybe 2 secs) and the power abruptly goes down.
What is it's problem? Anybody can help me? Please ask for further details, if you need any.