Question NO BOOT BIOS Flashback LED flashing

Nov 6, 2024
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Hi everyone!
I need help with an issue I'm facing, I'm suspecting I have a bug or malfunction of my motherboard. The model is ASUS ROG STRIX Z790-H GAMING WIFI. It's my personal build, I've had it for over a year with no issues. But this morning I woke up and when i pressed the power button, nothing was happening, the PC has power so it can't really be a PSU issue, the RGB's and LEDs are all working fine.
What I noticed was the BIOS flashback LED flashing green constantly which wasn't the case before. So I tried to figure out what happened, retracing my steps, the night before this happened I got myself a new Razer mouse Basilisk V3 Pro and also installed Razer Synapse, so at first I thought it could be some kind of weird bug that doesn't allow me to boot because of the mouse USB, well I removed the razer synapse and my mouse USB and it still didn't boot.
After a few hours of cleaning my PC and unplugging everything, I noticed something quite odd, when I power up my PSU there's a split second when the flashbeck LED on my motherboard doesn't start, if i press the power button fast enough the PC boots up normally with no issues and works perfectly fine, no performance issues no shutdowns, nothing... it works perfectly fine, but its quite a bother to switch off my psu and switch it on everytime i want to use my PC.
So my question is : Did anyone here ever had this issue and did they find a fix to it and a cause? I would love to recieve some help on this please !

Fixes I tried: Updating bios, uninstalling razer synapse and not using a razer mouse, unplugging cables and plugging them back in, updating windows, updating drivers, reseating the rams, using a different outlet, changing monitors. Im really out of ideas please help !

I also added 2 videos for reference : first one is a video of the BIOS Flashback flashing green with NO BOOT and second is a video of me turning off the PSU and turning it back on whilst pressing power button resulting in a succesful and normal boot.
 
Nov 6, 2024
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CASE - NZXT H9 Flow
MB - ASUS ROG STRIX Z790-H GAMING WIFI
CPU - I9-13900k
CPU Contact frame Thermal Grizzly
GPU - RTX 4090 Gigabyte Waterforce
AIO - Corsair Icue H150i Elite
PSU - Corsair Hx1500i Platinum 1500w
RAM - Gskill Trident Z5 7600mhz 32gb cl36
SSD - Samsung 990 pro 1x 2tb 1x 1tb
ASUS TUF RGB fans 3x
 
Nov 6, 2024
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what happens after about 5 seconds?
does it blink afterwards too or is it constanly on?

reset bios
check the flashback button if its predsed all the time
It constantly flashes, I left it for hours and it keeps flashing green and stopping me from booting
By reseting bios you mean loading optimized defaults? I already did that, I even updated it today same issue, there is nothing pressing the button.
 
Nov 6, 2024
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yea thats what im thinking... maybe the mouse usb somehow shorted the usb ports and now my motherboard keeps detecting somethin in the bios port and trying to boot it instead of letting me boot normally, so switching off the psu and on again gives me a split second to boot my pc before the motherboard detects "something" in the port again... atleast this is my theory... atleast it works... its just an annoyance to use the psu switch everytime i want to use the pc and maybe switching it on and off so many times is not healthy over long term, thats what worries me the most