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Why my desktop shut off and reboot unexpectedly?

HP Recommended
Pavilion Desktop 590-p0xxx
Microsoft Windows 10 (64-bit)

Why my desktop periodically shuts off/reboots unexpectedly?
This desktop connected to 2 monitors. 1 to HDMI and 1 to others.
When rebooting happens, it always begin with the monitor which is connected from HDMI.

This monitor first blackouts. If I move the cursor to that monitor and click several times, then it wakes up. But sometimes it does not work and start rebooting.

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