Have you tried to disconnect the power switch and jump start the board shorting the power pins on the motherboard?
CPU: Intel(R) Core™ i9-10900K CPU @ 3.70GHz
GPU: NVIDIA GeForce RTX 3070 OC
SSDs: Samsung SSD 970 EVO 1TB / Samsung SSD 860 EVO 2TB
RAM: 32GB (2x16GB) Corsair DDR4 Vengeance RGB Pro Black, PC4-24000 (3000), Non-ECC, Unbuff CAS 15-17-17-35, RGB LED, 1.35V
Motherboard: ASUS ROG STRIX Z490-E GAMING
PSU: 850W NZXT C- Series C850, Fully Modular, 80 PLUS Gold
Fans:
120mm Corsair LL Series, LL120 RGB, 9 Blade, PWM, 16 LED RGB Dual Light Loop, Single Fan Expansion Pack, 4-pin
Cooler:
Corsair H150i RGB PRO XT AIO, 3x 120mm ML120 PWM Fans Copper Heatsink Aluminium 360mm Radiator Intel/AMD
Case
Corsair Obsidian 500D RGB SE Mid Tower PC Case w/ Tampered Glass Windows, ATX/ mATX/ mITX/, 3x 120mm Light Loops RGB Fans