Any update on your issue?
The pc I built for my sister is suffering from similar issue.
Maximus xiii hero.
All rgb/rgb+ (strips, aio fans, case fans, case LEDs) go into rainbow mode on boot up but after post, they all shut down except for the motherboard LEDs. I've tried everything, except for reinstalling windows.
Armoury crate/aura is not detecting anything connected to the rgb/+ pins either but they all turn on rainbow mode on boot..
i got it fixed and working ,i have an idea about the cause of the problem but i can't say for sure that armoury crate was it but here is what i did
1.backup everything before you start just in case
2.remove armoury crate with asus uninstall tool which you can grab from here download use it and reboot
3.remove all files and folders remaining in the system including registry files which are a lot i removed them manually but you can use 3d party software if you know it will do the job after that reboot
4. download Aura Sync Utility form asus website note that you will need to download the standalone version which is shown in this pic
i found with help of reddit
5.download,extract and install LightingService first otherwise it won't work do that by installing AuraServiceSetup.exe
6.after installation is complete go back and run Setup.exe which can be found in the main folder
please note that after the installation and running aurasync it might not detect some of your hardware this is cause of asus decided to abandon the program and stick with armoury crate ,for me it didn't detect the gpu and the shutdown effect was on even if i turn it off from aurasync BUT the good news is there is an easy solution for that which is installing armoury crate
both the programs sharing the same folders so the gpu plugin that you need for aurasync to detect the gpu will be add automatically you can backup the plugin which you will find in C:\Program Files\ASUS\AacVGAHal and then remove armoury crate and continue with one program but if you like me having the shutdown effect on after turning it off from aurasync you'll have to keep armoury crate just to turn it off,you will not use armoury crate at all after that every time you need to change the lighting and effect use aurasync that's it BTW i don't use aura creator so i don't know about it