PC turns off on its own. Done my diagnosis. Ran out of ideas.

[ContraHacker]

Hello Readers.

 

Since yesterday, my PC has been turning off on its own. Not in any specific application. It turns off even when inside BIOS. No bluescreen, just turns off.

 

Steps I've taken:

 

1) Deep-cleaned the entire PC. Removed all dust from fans, case, slots, and cables.

2) Fresh thermal compound on both CPU and GPU.

3) Reseated the CPU.

3) Tided up the cables.

4) Tried with one stick of RAM.

5) Removed the Wi-Fi card and tried.

6) Tried a different GPU. (Used a GT 1030)

7) Downclocked the RAM to 2133.

8) Completely took out the motherboard and put it back in.

9) Tried with side-panels off.

10) Reset the BIOS

11) Plugged directly into wall power. I normally use a UPS.

 

Important Info:

 

1) Windows Reliability Monitor has no useful info.

2) When the PC turns off, the Power LED on the case stays lit. Pressing the power button does nothing, but holding it down turns it on again.

3) It's not like it turns off after a certain time period - sometimes I'm able to game / work for about 40 mins, other times it turns off within seconds of turning on.

4) With the current config and overclocks, the PC has been running rock-solid for a long while now.

5) Recently did a fresh win-10 install.

6) PC Specs:

• Ryzen 3 3300x (Ryzen Master's auto overclock) (Stock cooler)
• 2 x 8 Corsair LPX rated for 3000mhz, running at 3200mhz synced with the fabric clock.
• Gigabyte B550M
• Sapphire Radeon R9 280x 3GB - No OC.
• Antec 750W PSU
• Boot drive - WD Green 120 M.2
• 4 other SATA drives. 3 x HDD, 1 x SSD.

 

My haunches:

 

1) PSU Issue?

2) CMOS battery?

3) Short-circuit somewhere, underneath the motherboard or on the IO shield?

 

Help pls.

[Somerandomtechyboi]

10 minutes ago, ContraHacker said:

Hello Readers.

 

Since yesterday, my PC has been turning off on its own. Not in any specific application. It turns off even when inside BIOS. No bluescreen, just turns off.

 

Steps I've taken:

 

1) Deep-cleaned the entire PC. Removed all dust from fans, case, slots, and cables.

2) Fresh thermal compound on both CPU and GPU.

3) Reseated the CPU.

3) Tided up the cables.

4) Tried with one stick of RAM.

5) Removed the Wi-Fi card and tried.

6) Tried a different GPU. (Used a GT 1030)

7) Downclocked the RAM to 2133.

8) Completely took out the motherboard and put it back in.

9) Tried with side-panels off.

10) Reset the BIOS

11) Plugged directly into wall power. I normally use a UPS.

 

Important Info:

 

1) Windows Reliability Monitor has no useful info.

2) When the PC turns off, the Power LED on the case stays lit. Pressing the power button does nothing, but holding it down turns it on again.

3) It's not like it turns off after a certain time period - sometimes I'm able to game / work for about 40 mins, other times it turns off within seconds of turning on.

4) With the current config and overclocks, the PC has been running rock-solid for a long while now.

5) Recently did a fresh win-10 install.

6) PC Specs:

• Ryzen 3 3300x (Ryzen Master's auto overclock) (Stock cooler)
• 2 x 8 Corsair LPX rated for 3000mhz, running at 3200mhz synced with the fabric clock.
• Gigabyte B550M
• Sapphire Radeon R9 280x 3GB - No OC.
• Antec 750W PSU
• Boot drive - WD Green 120 M.2
• 4 other SATA drives. 3 x HDD, 1 x SSD.

 

My haunches:

 

1) PSU Issue?

2) CMOS battery?

3) Short-circuit somewhere, underneath the motherboard or on the IO shield?

 

Help pls.

When your mb turns off like that with the pwrled still on it usually indicates a short

 

Maybe run your pc outside of a case and see if it still shuts off

[ContraHacker]

1 minute ago, Somerandomtechyboi said:

When your mb turns off like that with the pwrled still on it usually indicates a short

 

Maybe run your pc outside of a case and see if it still shuts off

Will try that. Gonna be a hassle, just did cable management last night!

[zeli_666]

have u got friend who got compatable RAM ? if not what u exp. when your pc shutdown ?  only led blinks ? that means your MB is Ok, maybe i PSU i daubt that... because it wut reset... if only stays alive like led blink i whould try another memory or reseat all ram, or your HDD... try to use only one... and keep trying... i wish u a luck

[ContraHacker]

16 minutes ago, zeli_666 said:

have u got friend who got compatable RAM ? if not what u exp. when your pc shutdown ?  only led blinks ? that means your MB is Ok, maybe i PSU i daubt that... because it wut reset... if only stays alive like led blink i whould try another memory or reseat all ram, or your HDD... try to use only one... and keep trying... i wish u a luck

I can try different RAM although I doubt that's the issue since my RAM is new. I don't think its the drives because a drive failure (non-OS) would at most cause a BSOD. I'm getting a complete shutdown. To answer your question, the behavior is that the power LED remains on, no blinking.

 

Thanks for the well-wishes!

[Somerandomtechyboi]

1 hour ago, ContraHacker said:

Will try that. Gonna be a hassle, just did cable management last night!

Rip

[ContraHacker]

6 hours ago, Somerandomtechyboi said:

When your mb turns off like that with the pwrled still on it usually indicates a short

 

Maybe run your pc outside of a case and see if it still shuts off

So I didn't want to undo the cable management, so I have put insulating washers between all motherboard screw points and the standoffs. I also removed the IO shield. Currently writing this message using my PC. Has not crashed yet. If it does not, then I'm calling it a success.