I have had a quick check and it would appear that the 5v header/cables etc have not come loose. I have not installed or updated anything overnight either. As the screenshot shows, the RAM, graphics card and the light strip at the bottom of my case (Phanteks NV5) still syncs with whatever effects I set them to, literally just the fans - case fans as well as AIO fans.
I have tried reinstalling SignalRGB, I have also tried uninstalling MSI Center and enabling light control in the bios.
I’m actually experiencing the same exact issue. I only had Signal for a few days and it worked, but suddenly my aRGB fan lights stopped working but my RAM and my keyboard were still working through the app. When I uninstalled Signal and restarted my computer, my fans lit up so it’s not a wire connection issue and it’s Signal. I’ve uninstalled and reinstalled the app and the moment I install Signal, it turns off my aRGB fan lights and they won’t turn back on unless I uninstall Signal and restart my computer.
Might be a configuration thing, maybe they got set to have their brightness all the way done? You can find your log files here and if you create a ticket through our contact page we’d be happy to take a closer look!
I’d try a full system reboot and launching as an admin. If that doesn’t work, log files might help reveal what’s happening. Support team will follow-up when we have a chance!