Hi, so, hardware and BIOS stuff are outside my wheel-house for the most part so bare with me.

About a month ago I've been consistantly getting CPU Fan error when starting up my PC. My case has one CHA fan which controls a fan at the back and 3 fans at the front of the case and then the CPU fan which is a big chunky boy connected to the motherboard.

Sometimes if I leave the PC in the bios for long enough the CPU fan will start up on its own (but very rarely) and usually I have to turn off, unplug, unplug the 4 pin fan from the motherboard, plug it back in, turn it on and it'll immediately start with the PC starting no problem and will continue to be on as it should until I turn it off.

As far as I know everything is getting enough voltage and there's nothing physically wrong with the fan. I could set the BIOS to ignore CPU fan monitoring but theres no guarentee it would actually turn on if I did that- it'd just bypass the CPU error. I also have a uh, AIO Pump pin on the motherboard I could switch the fan to but I'm not sure what issues that could cause.

Any input (please dumb it down) would be really great. Here are the specs (some might be irrelevent)

Intel Core i7-7700K 4.2GHz (Kaby Lake) Socket LGA1151 Processor

Asus Prime Z270-K Intel Z270 (Socket 1151) DDR4 ATX Motherboard

32GB RAM

Geforce 3080 10GB

PSU is 1.2 volts and is using 1.1 (you might have to decphier that I'm going off memory)

Tysm, happy to answer anything to the best of my abilities.