Question Ryzen 2700 (non-x) 100% usage on single logic core

Jan 7, 2020
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Motherboard - ASRock B450M-HDV
CPU - AMD Ryzen 7 2700(NOT X)
GPU - GTX1050
RAM - 16gb
M2 SSD

Hi, help me please solve this problem - today i woke up, turned on my PC and bam freezing stuttering mouse on Windows, trying to start a game and PC just shut down with no errors or BSOD or anything. I tried to check system for malwares, viruses... nothing found. Then i load defaults in UEFI, zero effect. Checked if drivers is corrupted or smth, nothing, also clean deleted GPU drivers and installed brand new. So i went to HWMonitor to detect wtf is happening and what can i see - CPU#5 = 100%. I rebooted PC in safe mode, and there it's just OK so i disabled all non-Microsoft services and deleted all from Startup Programs, i reboot again and nothing happened still 100%, but now on CPU#14, i went to UEFI and turned off SMT, it helps, but i need it for rendering. So if anyone have any advice or answers please help me!

Sorry for my english, again :)
 
Jan 7, 2020
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What is your PSU? Shut downs like that are normally related to PSU issues.
KCAS 550W Silver, but it worked for like a year before shit started to happen. Also in HWMonitor VIN11 voltage says 0v on Motherboard

Edit. If it’s a PSU issue why it’s working just ok in safe mode?
 
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