I'm using R5-1600
It was alright for few months, but since yesterday.. it happened.
what should I do..?
Update BIOS, reset BIOS to defaults, check msconfig that processors are not disabled.
정희석, please open your Device Manager-Processors and post a screenshot. Please tell us more about your system - at least UEFI and OS versions, power supply, devices. Enjoy, John.
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