Question PC randomly shuts off and reboots ?

[SilObdam]

Hey guys, I have a gaming pc that has never worked properly. i have it for 4 years now and the last year problems got a bit worse with it nog giving flickering lines in my screen and then rebooting. my pc sometimes disables my graphics card and i have to manually turn it on in device manager. i tried everything but can't get it to work. I have factory reset my PC multiple times, uninstalled my graphics drivers multiple times but it still shuts off at random times and I dont know what to do from here. i hope you guys can help me.

Specs:
Motherboard: Asus RoG STRIX B450-F GAMING
CPU: AMD Ryzen 5 3600 6-Core
GPU: Gigabyte Radeon RX 5700 XT GAMING OC 8G
RAM: Corsair 16GB DDR4-3600 Kit
PSU: Seasonic S12III-650 80 PLUS Bronze
Storage: Seagate 2TB ST2000DM008 7200 SA3 HDD / Crucial BX500, 240 GB SSD

Video of PC shutting down:
https://photos.app.goo.gl/KmdaS3Y7Rz7bBwYz8

 

[Ralston18]

Look in Reliability History/Monitor and Event Viewer for any error codes, warnings, or informational events being captured just before or at the times of the described shutdowns and other problems.

Reliability History is very end user friendly and the timeline formation can reveal patterns.

Event Viewer requires more time and effort to navigate and understand - however; it can likewise be very helpful.

FYI:

How To - How to use Windows 10 Event Viewer | Tom's Hardware Forum (tomshardware.com)

= = = =

Just as a quick assessment the PSU is a likely suspect. Four years old - original to build? History of heavy gaming or video editing use?

 

[SilObdam]

How can i make sure its my powersuply before i buy a new one and the problem still occurs?

 

[XxDarkMario20xX]

How can i make sure its my powersuply before i buy a new one and the problem still occurs?

Could be many things but I would take a look at GPU with the flicking screen issues. Have you got a friend or family that could test your parts out or you can take it to repair shop!

With Seasonic S12III-650 80 PLUS Bronze its a 5 year warranty so would be best to start looking for a new PSU unit before it runs out because PSU do not stay at that power all the time and can degrade!

From Google copied your words flickering lines in my screen and then rebooting.


Possible causes:

• Outdated graphics drivers:
  The most common cause of flickering lines is outdated or corrupted graphics drivers.
  
  
• Overheating:
  If your graphics card is overheating, it can cause visual glitches like flickering lines.
  
  
• Loose connections:
  Check if the graphics card is properly seated in its slot and that all cables are securely connected.
  
  
• Damaged hardware:
  A failing graphics card or a damaged display cable could also be causing the issue.
  
  
• Power supply issues:
  In some cases, an insufficient power supply unit (PSU) can cause instability, leading to flickering lines.

 

[RTX 2080]

I also say that the power supply is the most likely culprit

 

[Shiznizzle]

I had this exact issue. Exact same issue. Random shutdowns. Totally random.

So i had some detective work to do.

Dust case out. Not heat related. Re-apply thermal paste on CPU and GPU. Did not fix it.
Take everything out and re-seat things. Did not fix it.
Change cables, all of them. Did not fix it.
Start swapping out parts. Memory, CPU, GPU and HDD. Did not fix it.
Which leaves the PSU and drives. Unplugged drives and changed the PSU. Did not fix it

Very little left to diagnose at this point and i was getting some good feedback from the work so far.

My instinct told me it was a faulty front panel on/off switch. Went to local computer repair shop and they did not have any new on/off switches but they did give me a used one to try.

Sure enough.

Faulty on/off switch.

All they do is open/close the circuit. Nothing else.

 

[Shiznizzle]

How can i make sure its my powersuply before i buy a new one and the problem still occurs?

Take the PSU out of case and take just the PSU to your PC repair shop. They have little PSU testers that plug directly in to the PSU out cables and can tell right away if the PSU is good or bad. IF they want ridiculou smoney to test the PSU, 25 squid or more, then say no thanks and just buy your own PSU tester and then you have one yourself.

You just plug the think into the PSU and it tells you right away if good/bad.