Power LED blinking while PC working fine

[nicoloconicolas]

Hi everyone, first post here as I am really puzzled on an issue I'm having with my computer.
 

I don't know what happened recently, but I noticed that my power LED is blinking after starting my PC. Other than that, the computer is working great as usual.

Usually when I turn on the computer, the LED will be off for like 10 seconds (memory training I think) then it will blink rapidly for 2 seconds and finally stay on.

 

As for now, instead of staying on after the rapid blink, it is blinking at a steady pace, 1 second on then 1 second off. It only does this when I start the computer after a shutdown.
When I reboot the computer, the LED starts working normal again and stays on. Also, if I put the computer to sleep, the LED turns off and then after I wake it from sleep the led stay on as normal.

I'm running the Ryzen 7 7800X3D in an Asus Prime B650-PLUS.
The issue first happened with an older BIOS version (1656) and I did update the BIOS (1811 latest as now) but the issue still persist.

 

I built multiple computers including this one, and I have no idea why it's doing this so if you have any suggestion I'll try.
Thanks for your help guys !

[nicoloconicolas]

Hi guys, replying to myself as I think I figured it out, it's caused by my monitor beeing too slow and the motherboard not detecting a display.

My monitor is an MSI Optix G241 connected via Display Port to my GPU (RTX 4070) and the thing is that it is quite slow to wake from sleep when there is a video signal.
This has always been the case but it doesn't bother me at all (it takes 3-5 seconds sometimes to detect the signal).

Recently I changed my setup, I went from dual monitor with the MSI monitor and another old LCD one (connected in HDMI and using an HDMI to DVI adapter) to just the MSI.

Before, the BIOS POST screen would show up on my LCD monitor because it is fast to wake from sleep and then, when Windows would boot, the primary display would switch to the MSI monitor.
Now that I just have the MSI monitor plugged in, the motherboard thinks that I have no monitor connected as it is too slow to wake from sleep when booting the computer.
This makes the power LED blink slowly, indicating a VGA problem, but then the computer boots into Windows and works fine because the monitor finally woke up.

Not sure how I will fix it, maybe increase the POST screen time, I'll follow up if I have a fix.