Originally Posted by IronBadger9
Open the Logitech client, go to settings (press the gear icon), go to the G410 tab and uncheck 'enable device startup effect'. Update it too if you can.
If that doesn't work then it might be a profile issue
That only disables the rainbow startup effect. I'm talking about when you press the physical lighting button (next to game mode button at top right of kb), shouldn't it keep the lights disabled even after reboot, until you press the button again to turn them back on? The only way I've found to keep lights disabled after reboot, is to set them all to color black in LGS.