I have this exact issue right now. I can set effects like rainbow, cycle, breathing, but if i define static colours the ram stick lights just turn off. This is when using the G-Skill Lighting software.
With ASUS AURA, which worked for a day or two but now doesn't, all the ram goes dark as soon as i click sync.
Unsynced and uncontrolled it does its pretty default rainbow cycle, so the lights are working fine, it seems to be more of an issue of trying to define custom stuff. It previously WAS working and I had a great custom pattern for a little over a day and then it abruptly stopped. Is there a way to 'factory restore' the RGB on my RAM?
Windows 10 w/ latest updates and stuff
MOTHERBOARD : ASROCK X570 Phantom Gaming 4
CPU : AMD RYZEN 7 3700X
GRAPHICS CARD: ASUS DUAL GEFORCE RTX 2080 SUPER (Model DUAL-RTX2080S-O8G-EVO)
MEMORY (RAM) : 32GB (4x 8GB) G-Skill Trident F4-3600C18-8GTZN