I've recently had to send my father's 1TB Adata XPG S40G SSD and his Aorus B450M for repairs due to a few issues (the backpanel audio was not working and the system sometimes couldn't find the SSD) and I had to take it apart. Today I've got it back together and the fans are way louder than previously. They seem as loud as the R9 290X fans. I've tried setting the fans to 'Quiet' in System Information Viewer (the app in Gigabyte's App Center) then changing the fan curve manually and nothing. I also set them all to PWM. The CPU fan (an OG Wraith Prysm) did get slower and it went as low as 300 RPM. The case fans seem to run at the same speed with no change because the noise is basically the same. The PSU is a Seasonic 520 SIII Bronze and as far as I can tell, it's at basically the same noise level. The GPU is a Gigabyte GTX 1650 Eagle and has the silent mode when without load. The case fans are 3 XILENCE Performance A+ XPF120RGB and 1 stock from the Deepcool 50 Matrexx case. All 4 are connected through a hub (Deepcool FH-10) to System Fan 1. The RPM both in BIOS and SiV for System Fan 1 (and 2 - I don't know why I see System Fan 2, I've connected the hub to the port near the CPU 8 pin port) is 0. What can I do?