This is resolved. Here are the details for people who may have similar problem.
Problem: LED on bottom and side of laptop is turned off, but keyboard LED is working and can change colors.
Cause: I reinstalled Windows 10 and installed
Aura Sync 1.07.66 since I assumed that's the original application used to change LED colors across all Asus products. Upon opening the program, LED on the bottom/sides switched off and no option on Aura Sync was found to turn it on. Aura Sync does allow me to change colors, brightness of the keyboard LED.
Resolution:
- Using CCleaner, uninstall Aura Sync and all the RGB components that installed with it.
- Clean registry and restart
- From the ASUS support website of my laptop G731GV, download and install "ASUS System Control Interface V2", "ROGLiveServicePackage 1.0.9.6", "ARMOURY CRATE Service" (any version)
- Still from the ASUS support website, download and install "ArmouryCrateService & ROGLiveService UpdatePackage" to update.
- From Microsoft Store of Windows 10, download and install "Armoury Crate"
- Restart
- Start Armoury Crate -> System -> Lighting -> Settings -> Lightbar
to turn bottom/side LEDs on and sync with the colors you have set for the keyboard.
* you can use Amoury Crate to change the colors of LED, fan speed, view hardware monitoring numbers, etc.