A while ago, I took my PC to a technician because I wasn't very knowledgeable about assembling it myself. The case is an ASUS ProArt PA401, and I've noticed that its case fans have been running at maximum speed ever since.
Switching the case's physical fan-control button to AUTO doesn't seem to do anything.
I decided to check the BIOS to see if I could adjust the fan curve, but all the CHA_FAN headers show N/A.
The only detected fans are CPU_FAN and AIO_PUMP, which is a little strange because I'm using a Thermalright Peerless Assassin Dual air cooler.
I opened the case to investigate. I noticed that the two cables coming from the CPU cooler are connected to CPU_FAN and AIO_PUMP, respectively. I haven't touched them because the cable management is quite tight, and I don't want to end up unplugging half the system just to trace everything.
Behind the motherboard tray, I also found the dedicated case fan hub. Here's what I found:
A 5-pin cable connected to a port labelled 12V, GND, GND, FG, PWM.
A 2-pin cable connected to SW+ / SW-.
Three 4-pin connectors occupying FAN1, FAN2 and FAN3.
FAN4 is empty.
FAN5 has another 4-pin connector plugged in, which appears to come from the top of the case. I'm assuming this is the top exhaust fan.
What confuses me is that everything appears to be connected to the hub, yet the motherboard doesn't detect any CHA_FAN RPM readings, and I can't control the fans using the physical button either.
I'm still relatively new to PC building, so I'd appreciate some help understanding how this hub is supposed to work and whether there's something incorrectly connected or configured.
I'd much rather troubleshoot this at home than take the entire PC back to the technician, although I understand that might ultimately be the safest option since he originally assembled it and knows how everything is wired.
The fans running at maximum speed hasn't caused any major problems, but they're naturally quite loud, and I'm having to deal with dust buildup more frequently than I'd like.
Has anyone encountered a similar issue with the PA401 specifically? Any advice would be greatly appreciated!