ROG STRIX Z790-H GAMING WIFI doesn't boot until plugged out

[Clayn]

Hi,

Recently my PC stopped booting until it's been plugged out for about 25 seconds. It doesn't respond to power button at all, no fans spinning, nothing.

It happens in 90% of cases, however it managed to turn on without problems a couple of times, though it seemed random.

What I have to do to turn PC on is to plug it out for around the time it takes for LED on the VRM Heatsink Array to turn off then plug it in and press power button. If I wait for too long (e.g. couple of minutes) - it won't start and I'll have to plug it in and out again. 

Worth mentioning that I can restart the PC without any issues. Initialy, I thought that it's a PSU issue, so I tried changing it, but it didn't help.

Problem appeared out of nowhere, I didn't make any changes in my hardware, however I've had a couple of power outages if it is something that may have lead to this.

My specs are:

• ROG STRIX Z790-H GAMING WIFI
• Intel Core i9-13900K
• AORUS GeForce RTX™ 4080 16GB XTREME WATERFORCE
• 2 x KINGSTON SA400S37960G
• G.Skill DDR5-6400 32768MB PC5-51200 (Kit of 2x16GB) Ripjaws S5
• ASUS TUF Gaming 1000W Gold

What can be the issue? Can it be due to some configuration in BIOS, or is it something with capacitors/CMOS battery?

Thanks

[Silent_Scone]

Hi @Clayn 

It could be overcurrent protection, but try the following:

Firstly:

1. Reseat all power connectors (24-pin, 8-pin EPS, GPU cables).

2. Try booting with minimal components (one RAM stick, no SSDs, onboard GPU).

3. Reflash BIOS via USB Flashback to 2801

[Nivero]

hey i have this same problem, so you have any next step when this don’t work?

[Nivero]

hello, have you found any solution, I've had exactly the same problem for about a week but I haven't found anything yet

[amazanik]

Have the same issue....

My solution: enable in BIOS S4+S5 mode - total power-off, now OK.

When I shutdown the motherboard, the BIOS FLBK LED starts blinking green continuously.
If I shutdown the PSU, then power it on, the BIOS FLBK LED starts blinking green again.
In this state if I try to power on the motherboard nothing happens : no fans running, no POST.
Now if I click the CLEAR CMOS button, the motherboard starts, do POST normaly (less then 30s) and enter BIOS. I set default parameters, reboot, windows 11 starts and all run fine, until I shundown the motherboard again.