Ensure the24-pin ATX and8/4-pin CPU power connectors are firmly plugged into the motherboard. If your CPU has onboard video, remove the discrete GPU and display from the motherboard's video outputs to rule out GPU issues.
ASUS Prime Z270-A ATX LGA 1151 DDR4 HDMI DP USB-C - PRIME Z270-A
ASUS PRIME B365M-A LGA-1151 DDR4 8th/9th Gen Intel mATX Motherboard
ASUS Prime Z590-P LGA 1200 Intel Motherboard
ASUS PRIME Z490-V Motherboard Intel Z490 10th gen DDR4 LGA 1200 ATX w/ IO Shield
ASUS PRIME Z490-P Motherboard Intel Z490 LGA 1200 ATX With Original Box
ASUS Prime Z390-P LGA 1151 Intel Z390 SATA 6Gb/s USB 3.1 ATX Intel Motherboard
