Laptop PC turning off in the middle of work

[H21x]

My laptop PC turns off all of a sudden in the middle of work, without any warning or any notification. I've tried everything possible: installed operating system (Windows 11, Windows 10, even some custom builds to check if doing that solved the issue) from scratch 5-6 times; changed the CMOS battery, ran CPU stress tests and measured CPU temperature (it didn't turn off even after one hour of extreme CPU stress tests; the temperature reached 95°C consistently; the fan and heat sink is working fine; the thermal paste was replaced too). Along with these I also ran the memory (RAM) test and hard d

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