Question PC only starts directly after turning on power

[Kumariael]

Hi. I have a problem with my PC since a long time. I think it wasn't directly after i build it 2 years ago but shortly after. The PC only turns on directly after i supply it with power. If i turn on the power and wait a few seconds or shut it down and try to turn it on again nothing happens. I need to turn of the power, wait a few seconds, turn it on again and press the power button.

I tried a lot of things:

- updating BIOS
- turn of FastBoot
- remove all Drives (except Boot Drive), the GPU and all Peripherie
- a new PSU
- Turn off ERP in BIOS
- definitely no heat problem
- reset CMOS
- i rebuild the whole PC in a new Case while changing the PSU so all connections should be fine

I don't know what else i could try except a new Motherboard, RAM or CPU, which isn't that easy without buying new stuff (probably lend some from work).

Specs:

- Windows 11 Pro
- Asus X670e Plus Wifi
- AMD 7700x
- XFX 7900 XTX
- G.Skill Trident Z5 Neo Expo RGB DIMM Kit 32GB, DDR5-6000, CL 32-38-38-96
- 2TB Samsung 980 Pro
- LianLi Edge EG1300W Platinum, old beQuiet! Pure Power 12M 1000W

Does anyone have any idea what else i could try or what could be the problem?

 

[COLGeek]

Have you ever disassembled the system to verify that you don't have any extra mounting points/stand-offs under the motherboard itself? These can lead to short conditions and similar issues like you are describing.

 

[DaleH]

Hi. I have a problem with my PC since a long time. I think it wasn't directly after i build it 2 years ago but shortly after. The PC only turns on directly after i supply it with power. If i turn on the power and wait a few seconds or shut it down and try to turn it on again nothing happens. I need to turn of the power, wait a few seconds, turn it on again and press the power button.

I tried a lot of things:

- updating BIOS
- turn of FastBoot
- remove all Drives (except Boot Drive), the GPU and all Peripherie
- a new PSU
- Turn off ERP in BIOS
- definitely no heat problem
- reset CMOS
- i rebuild the whole PC in a new Case while changing the PSU so all connections should be fine

I don't know what else i could try except a new Motherboard, RAM or CPU, which isn't that easy without buying new stuff (probably lend some from work).

Specs:

- Windows 11 Pro
- Asus X670e Plus Wifi
- AMD 7700x
- XFX 7900 XTX
- G.Skill Trident Z5 Neo Expo RGB DIMM Kit 32GB, DDR5-6000, CL 32-38-38-96
- 2TB Samsung 980 Pro
- LianLi Edge EG1300W Platinum, old beQuiet! Pure Power 12M 1000W

Does anyone have any idea what else i could try or what could be the problem?

You have tried a new PSU. I would measure the power supply voltages when the problem is present and proceed from there, based on the results of the test. There may be something loading the PSU. The PS_On pin should be low to turn on the supply. What voltage is it at when trying to power on the PC?

 

[Kumariael]

I posted the issue in another Forum and disassembled the whole PC and removed everything non vital from the motherboard. The issue is present with the old and new PSU. Seems to be a problem with the motherboard.

 

[COLGeek]

I posted the issue in another Forum and disassembled the whole PC and removed everything non vital from the motherboard. The issue is present with the old and new PSU. Seems to be a problem with the motherboard.

I tend to agree at this point. Is your motherboard's BIOS running everything at default settings? No tweaks, no OC, etc?

Also, if you remove the GPU and just use the integrated, does the behavior change?

 

[DaleH]

I posted the issue in another Forum and disassembled the whole PC and removed everything non vital from the motherboard. The issue is present with the old and new PSU. Seems to be a problem with the motherboard.

But you haven't eliminated a problem with the power. To have more confidence in your assumption, I'd measure all the voltages. If one of them is not correct, start removing things to see if the voltage returns to the correct value. If the problem is occurring with the new PSU, it may not mean that the problem is not the PSU, but only that whatever was loading the old PSU, is still loading the new PSU. Better to have a high rate of confidence before spending money on parts.

 

[Kumariael]

default settings

I tried default BIOS and even changed the CMOS. Same result.

start removing things to see if the voltage returns to the correct value

I removed everything non vital. I had only the MB, CPU and 1 RAM Stick. And the power cable was connected. No fans, no mouse nothing. Same result.

 

[COLGeek]

Seems the motherboard is confirmed as the likely culprit.

 

[DaleH]

Seems the motherboard is confirmed as the likely culprit.

Not necessarily, what was the voltage test results.

 

[Kumariael]

You are pretty adamant on voltage tests^^ I dont have equipment for that and what should i measure after everything is disconnected?

 

[DaleH]

You are pretty adamant on voltage tests^^ I dont have equipment for that and what should i measure after everything is disconnected?

I like to make measurements when possible, and then procede from there. You would need a DVM, but if you're not familiar with it's use, then probably you can't do this. One would measure the voltages at the power supply connector on the motherboard - with and also without a load. Sometimes it's just better to take it to a shop where they have tools and parts to troubleshoot and repair - even though one would like to be able to solve a problem on their own. The correct operation of everything depends on the supplied power, so it's good to be able to confirm that the power supplied is correct with and without a load.

 

[COLGeek]

While there could be a power issue, seems that may not be relevant here. Assuming both PSUs used are functional, the issue remains. Both are good devices. Not sure more power testing serves a purpose in this situation.

 

[DaleH]

While there could be a power issue, seems that may not be relevant here. Assuming both PSUs used are functional, the issue remains. Both are good devices. Not sure more power testing serves a purpose in this situation.

You are likely correct. If the crimp connector on one of the

While there could be a power issue, seems that may not be relevant here. Assuming both PSUs used are functional, the issue remains. Both are good devices. Not sure more power testing serves a purpose in this situation.

Agreed. If there were to be a low voltage on one of the voltages with both PSUs installed, that could be a clue to where to look next. That would indicate that both PSUs were ok but something external to them is causing the problem.and then one would pursue the problem based on what votage it was and where it was used. My experience is in tracing problems to the component level, this is not necessarily for everyone.