Question Light At the Back of PC that Flashes Intermittently While the PC is Off?

[The Guy From The Thing]

my motherboard is an Asus ROG Strix B550-F; when the pc is turned off, and the rest of my room is dark, I can see the rgb light against the wall behind it and although that doesn’t bother me, I noticed it sort of flickers from time to time

to resolve it, I went into Bios and disabled the onboard LEDs while the PC was in sleep or powered down states. this removed the rgb light; however, there was still another light visible against the wall which was more…white, I guess?

this light is the one that was ‘flickering’ or flashing at random inconsistent intervals, not the rgb. setting the rgb in Bios does nothing, as evident from my explanation. the light isn’t exactly bright and the flashes are nowhere near noticeable enough to light up my room or reflect off anything else but I’m just confused?

peering into the case, I can’t exactly see anything, it’s pretty dark. same with the rgbs though, I couldn’t really see them in the pc, so I had to go off the lights on the wall. any ideas what this could be?

rest of specs;

CPU- Ryzen 7 5800x
GPU- Gigabyte RTX 3070 Eagle
Ram- Corsair Vengeance RGB 4x8 ddr4-3600mhz (rgb is off when the pc is off)
Cooler- Deepcool AK500 (no rgb)
Case- Phanteks Eclipse p360a (case fans have purple rgb but they are not on when the pc is off)
PSU- Phanteks Revolt Pro 1000w

 

[drea.drechsler]

Is it on the LAN port? If so, it's the LAN activity light flashing indicating it's "talking" with the router. The network (LAN) circuit normally continues operating even with the PC is off but power is applied.

You can disable it by finding the Network Adapter advanced properties in Device Manager. I think the setting is "Wake on Lan" also looke for "Wake on Magic Packet" or anything else that says "Wake on (whatever)". Make sure they're disabled.

Your system won't be able to wake on a signal from the LAN, but that's a feature useful mainly for managed systems in a corporate network where they wake up systems to push out updates during off hours.

 

[The Guy From The Thing]

Is it on the LAN port? If so, it's the LAN activity light flashing. The LAN circuit normally continues operating even with the PC is off but power is applied.

You can disable it by finding the Network Adapter advanced properties in Device Manager. I think the setting is "Wake on Lan", make sure it's disabled. You're system won't be able to wake on a signal from the LAN, but that's a feature useful mainly for managed systems in a corporate network.

oh it might be, if it’s coming from the back and I’m unable to see it from looking into the case…that’s plausible

with the rgb, I can at least kind of see where it’s coming from inside the case, but with this light, I can’t see anything by looking in. so it might be coming from the back

I can’t easily check due to how my pc is positioned by this does make a lot of sense. was worried something might be wrong


Edit: it’s a pretty inconsistent “flash”, but I guess that’s normal, assuming it is the LAN port? it’s not constantly flashing, just sometimes here and there

 

[drea.drechsler]

....
Edit: it’s a pretty inconsistent “flash”, but I guess that’s normal, assuming it is the LAN port? it’s not constantly flashing, just sometimes here and there

I think it's only flashing in response to the router sending it something which happens irregularly, probably "keep alive" packets or something similar. It is the same with mine...or would be since I disabled the Wake on Lan features. And BTW, doing it in BIOS settings isn't sufficient since it appears the OS re-enables it when the driver loads up. You have to do it in the OS, Device Manager being easiest.