Hi jjmentat.
Your memory hardware is different than your hard drives. But it can be lots of things.
The light you see most likely is your hard drive spinning up. Even new computer with those new hard drives called ssd's still show activity lights. That's just for people to at least know the computer is doing something.
If you're up to it, if you haven't looked in the computer box for quite some time, simple physical maintenance for free may help. You can manually go in and do dust clean up off the cpu fans, power supply and case fans. There's a large bunch of cables that end in a big white connector that comes from the power supply and connects the the Mother board, which everything else is usually handled. That can be pulled and blown out for starters. Another thing to try if able is to find your memory sticks, pull each one at a time, blow out the slots they come from, wipe the metal connector strip with a soft cloth and reinstall them.
Computers vibrate and over time can loosen devices.
Win10 has a couple of installed programs you probably should try as well and they won't hurt you. Go to lower left 'START' > WINDOWS ADMINISTRATION TOOLS > WINDOWS MEMORY DIAGNOSTIC, choose it, then select the first option in the pop up window. Make sure you save anything you were working on and follow the instructions.
This is a good program and the results are strongly dependable.
I should have asked what is your computer level or experience as a user.
gl
