My HP Envy Touchsmart somehow power off suddenly.
First, I think maybe the CPU too hot ( I googled it), then I install lm-sesnors and watch it , but it work fine. It under 80 degree and no power off issue.
Second, I though I add 8G extra RAM, maybe that RAM is defeat, I pull out the extra RAM, but it still power off when I try to move the laptop.
Third, basically yesterday I already know when I move the laptop screen or power connector it will power off. But my though is this laptop has something broken inside. And I may need send back to HP Support ( that's I don't think it is easy task, because most of time it work fine, how can I explain what's wrong to support people) . Suddenly I got an idea when my hands still hold the screwdriver. Why not check the screw around the screen and laptop's body, it did feel loose , after I tighten it. There is no abruptly power off issue now.
Lesson learn: Hard question ( no idea how it happened ) may have easy answer.