From my experience I'd assume its probably fine
I've had two motherboards that did something similar. Older motherboard kept lighting up the RAM led despite nothing being wrong with the ram that I could tell, no crashing or anything, no memory test errors etc. Never had any problems with the ram.
My current motherboard is giving me a 'CPU' error LED despite everything working just fine. It's been doing this with 3 different processors but haven't had any issues.
If nothings wrong as far as you can tell it's likely fine, especially since you're booting up with no issues.