So I replaced the motherboard with the following:
Same issue with a slight improvement. Now the psu fan spins for a quick moment, then stops, as well as the CPU fan.
Question though: would the CPU fan possibly failed, and would that cause the PC to no boot? I'm sorry if that's a stupid question, but I'm grasping at straws and just considering buying all new components and starting from scratch.
Okay I have cancel the order for the case and will purchase another and is this the GPU you recommend? Gigabyte Radeon RX XT Gaming OC 8G (8GB GDDR6/PCI Express 4.0/1685MHz - 1845MHz/14000MHz) https://www.amazon.co.uk/dp/B082P78B6Q/ref=cm_sw_r_cp_api_i_erRiFb931MN60