Why is my Computer shutting down?

Thinking that it may be Fans not working.

Heat reading from the CPU A are 104 on start up. But continues to climb to 140.

U3 Heatsink reading same thing 119 at startup 135 after computer on for a few minutes. Don,t hear any fans running inside.

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Try reconnecting all of the fans as well as any sensor wires. If that doesn't help, clean out the system thoroughly and replace the thermal paste if possible.

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