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#11
What you posted is exactly how a forced shut down should happen, or when power supply is cut off. But before there is a confirmation that it is a power supply issue, I would usually advise to check for system errors, followed by confirmation that it is hardware issue.
Either way you can go ahead and jump a step to replace the power supply and if the restart doesn't happen then it's solved.
If it still happens then we can start looking at software troubleshooting.