Looks like a spark...

[Whope43]

Ok, I have a ROG Crosshair VIII Hero (WI-FI) X570, I recently had to replace the water pump in it.  Got it all done today and working on getting the bubbles out of the lines when I noticed this light flashing.  I have looked through the manual and couldn't find anything.  I have no idea how long it's been doing it, I built it about 3 years ago.  Any help would be great...

[aledsav1]

Looks like it might be led for data transfer from drive to mobo, regardless what it is it just a mobo led blinking nothing sinister

[aledsav1]

ROG CROSSHAIR VIII HERO - ASUS

 

 

PDF

 

The Storage Device Activity LED lights up or blinks when data is read from or written to the storage device or storage device add‑on card.

[johnt]

Maybe a reflection from the hard drive LED? The blinking pattern is consistent with hard drive LED behavior and the weak light makes me believe it's a reflection. I don't think it's a spark... Here is a diagram of your motherboard from the manual. The arrows shows where I think the reflection is occurring.

 

[BiotechBen]

An arc would be either white or blue and generally arrhythmic, that's red and flashing rhythmically, likely an activity LED or the reflection of an activity LED.

 

Unless of course you've got lithium salts or strontium combusting O.o (produces red burn color).

[Whope43]

Ok great thanks for the help...