power on pc not working

My motherboard is the ASUS Z490 Prime A, I have it connected using a 24 pin connector that connects to my power supply and a CPU 8 pin connector. I know that my motherboard is not receiving power because according to the manual when you turn on the power supply even without powering on the PC it...

I am making my first custom water cooling loop soon and I only want to do the CPU. I'm not overclocking or anything I just prefer the look of custom loops compared to AIO and air coolers. I am wondering if the parts that I've picked are compatible with each other and what fittings and tubing i...