My computer (HP Pavillion) also shuts off randomly. I have thoroughly cleaned the CPU heat sink and fan; I even aimed an external fan at the open tower to add to cooling; still shuts off. The only thing different in my case is that, if the computer won’t restart on button push, if I give it a smack on the outside of the tower case, it will then restart. Problem thus seems to be mechanical, not heat, but I don’t have a clue what the source is.
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With the power off check all connections to ensure they are firmly home. With signal connections take them out and put them in again – same applies to SATA power and signal.
Clean all edge connectors, in particular RAM and any add-on Video cards.
If it still does it after that then while it is running gently move any cables with something insulated, like a small paint brush, while watching the screen. Using the brush end itself carefully on the board might make something show up, or even gentle tapping. The place that needs least touching or tapping to produce any change (good or bad) is close to where the problem lies. Be VERY careful because I probably shouldn’t really be suggesting you do anything inside with the power on unless you are qualified to do so.
EDIT:
I am assuming it is a desktop/tower rather than a laptop.
Always pop back and let us know the outcome – thanks
message edited by Derek