Question PC black screens and restarts inconsistently, even in BIOS

[Dutaki]

Hello, I'm in need of some help, my PC black screens and restarts inconsistently, even in BIOS.
I'm really at a loss what to try next. I've tried removing my OC, removing GPU card, running stress tests on GPU and CPU temps all well under 80. There is no consistency to the crashes, sometimes I can't get it to turn back on until I turn the power off on the PSU. It seems to crash more the more it crashes... And less the less it crashes. It's sounds dumb, but that's the only consistency, if it's crashing it's going to do it a lot, if not it maybe good for 2 hours.

CPU- 9900k
MB- asus rog strix z390-e gaming
GPU- 2070super
Ram- G.SKILL Trident z space DDR4 space 3200 c16 space 4x8 GB
Ssd - SN770 2TB main drive
PSU - corsair RM850X (new last summer)
CPU cooler - Gamerstorm watercooled CPU cooler
Case - Phanteks P600s computer case

Additionally this is a new problem, just started last week. PC had been fine for a year.
Additionally, got rid of my OC and when it black screened in the BIOS there was no GPU installed.

 

[COLGeek]

Is this system attached to an UPS or surge suppressor?

 

[Dutaki]

Is this system attached to an UPS or surge suppressor?

Yes

 

[COLGeek]

Try removing and powering directly to outlet.

 

[Dutaki]

Stil

Try removing and powering directly to outl

 

[COLGeek]

Under normal circumstances, I would question the PSU because of something you said "sometimes I can't get it to turn back on until I turn the power off on the PSU".

That is often the sign of a failing PSU.

 

[Dutaki]

It's gotten worse, my PC now won't turn on the motherboard LEDs show flashes red for CPU and yellow for ram, then repeats. It no longer turns on.

 

[COLGeek]

Do you have access to another PSU to swap into your system for testing?

 

[Dutaki]

It's gotten worse, my PC now won't turn on the motherboard LEDs show flashes red for CPU and yellow for ram, then repeats. It no longer turns on.

New PSU from my other working machine has the same results.

 

[Dutaki]

Here is the video of what my motherboard shows:

View: https://youtu.be/DvRI3QGsyTw?feature=shared

 

[COLGeek]

Have you reset the motherboard BIOS to default at any point during your troubleshooting?

 

[Dutaki]

Have you reset the motherboard BIOS to default at any point during your troubleshooting?

Negative, I only removed the manual OC and set it to auto. I updated the bios last fall and no issues.

 

[COLGeek]

Negative, I only removed the manual OC and set it to auto. I updated the bios last fall and no issues.

Then manually reset and see if it makes a difference.

The method I recommend:

1. Disconnect all power sources. Power cable, video, powered speakers, etc.
2. Remove the battery.
3. Press the power button to discharge residual power stored in system components.
4. Wait at least a minute with battery removed (probably not necessary, but out of habit I have done this way for decades).
5. Reinstall battery.
6. Reconnect all previously disconnected things.
7. Power on.

 

[Dutaki]

Then manually reset and see if it makes a difference.

The method I recommend:

1. Disconnect all power sources. Power cable, video, powered speakers, etc.
2. Remove the battery.
3. Press the power button to discharge residual power stored in system components.
4. Wait at least a minute with battery removed (probably not necessary, but out of habit I have done this way for decades).
5. Reinstall battery.
6. Reconnect all previously disconnected things.
7. Power on.

I did all the steps, after powing back on it flashed the red and yellow light, turned off, and then turn back on and is stuck flashing the yellow and red light.

 

[COLGeek]

Sounds like a possible motherboard failure at this point.

 

[Dutaki]

Sounds like a possible motherboard failure at this point.

After 4 minutes being powered on it started flashing green lights, I got into bios. 2 minutes after that it shut down booted up three times and shutting down with red and yellow lights. Now it's booted to Windows... I feel like it's going to shutdown any second. Is there a Motherboard diagnostics tool or something I can run to tell me if a part of the MB is failing?

 

[Dutaki]

Just restarted again with same flashing lights, is there any other steps I can take besides buying a new board?

 

[Dutaki]

When I remove all the RAM it still does the same thing... Could it be a RAM issue or does that mean it's something other than it?

 

[COLGeek]

You can isolate the issue if you have another system with known good parts that you can swap with.

 

[Dutaki]

You can isolate the issue if you have another system with known good parts that you can swap with.

Yea, I don't have that stuff. I'm going to send it into ASUS, it's $40 to send in, hopefully the repairs aren't expensive.

 

[COLGeek]

Yea, I don't have that stuff. I'm going to send it into ASUS, it's $40 to send in, hopefully the repairs aren't expensive.

Good luck