Windows 10: PC randomly powering off then on

Every so often when I'm on my PC, it randomly restarts. Sometimes it gets paired with "reboot and select proper boot device or insert boot media in selected boot device and press a key"I can temporarily fix it by just reselecting my HDD as the boot drive, but it doesn't show my SSD on the boot list

:)

 

Lost Power, now PC won't boot. Powers on and clicks.

I had tried both of those steps. Neither worked. I have a replacement power supply on order. Should be here on Monday. Thanks for the suggestions.

 

Overclocking / Undervolting guide for Vega 56 or 64?

Here's a quick laundry list:

List of software to use for overclocking and testing
Examples:
Wattman (and how to find and use it, like an overview, including profiles)
Unigine Valley or Heaven (use this for quick testing while changing settings in Wattman and checking for stability / artifacts) ...just suggesting this
How to monitor cores / mem speeds and temps during testing (I've seen screen overlays, and others using GPUz)

Step-by step overclocking in Wattman
Fan speeds
Power limit
Temp limit
Voltages
Core speeds
Memory speeds

 

My PC was shutdown suddenly by power cut off so now it had some errors

Hi,

I understand your concern and will assist you to resolve the issue.

• 
  Have you updated all the Windows and optional updates?
  
• 
  Have you updated all the Drivers?
  
• 
  What is that exact error message?
  

I suggest you to follow the steps below and check if it helps.

Step 1: Run the
Power troubleshooter.

Windows 10 has a built-in troubleshooter to check and fix issues with power. I would suggest you to run this troubleshooter to check if the issue is with your Power.

Refer these steps:

• 
  Press Windows key +X, select
  Control panel.
  
• 
  Change the view by option
  on the top right to Large icons.
  
• 
  Click on troubleshooting
  and click on the view all option on the left panel.
  
• 
  Run the Power
  troubleshooter.
  

Step 2: Change the “Power plans” settings.

A power plan is a collection of hardware and system settings (like display, sleep, etc.) that manages how your PC uses power. The power plans you can use depend on the kind of PC you have.

http://windows.microsoft.com/en-us/windows/power-plans-faq#1TC=windows-8

Keep us posted on this issue so that we can assist you better.