Hi, out of nowhere my Cooler Master Hyper 212 rgb fan on TUF x570 plus mobo started doing this: Right after start, it goes into a start/stop mode where it switches between running and complete stops. Someties I get a CPU error screen on startup with only option is going into BIOS, then when I exit BIOS without changing anything, or just restart manually from the screen, sometimes it goes back to the error screen, sometimes I'm able to start Windows normally. Once in Windows, the start/stop continues, but when I tried to put some load on the CPU which got it to warm up, the CPU fan seemed to follow the temperature and work normally. Once the load was off, it went right back to start/stop. One more thing: I tried to switch the cables to a different dedicated header on the mobo. Normally it's in CPU_FAN and the RGB cable is in the RGB header right next to it (the fit on the RGB cable isn't great, it feels like it's not "locking" really, but it always worked as intended). When I put the cable in CPU_OPT (optional) and leave the RGB cable unplugged, the fan is constantly on 100 % RPM (I assume), it doesn't show up in HW Monitor. It also sometimes goes to the error screen on startup, sometimes not. BUT when I have the cable in either header AND the RGB cable is plugged in, the CPU fan always goes into the start/stop mode. Bizzare. When I plugged the fan into a different header (chassis fan) it did'nt fix the problem (still start/stop) Any suggestions anyone? Could it be a power issue? Or the fan is just broken? I also tried 2 RAM sticks instead of 4. Thx for help.