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.
GIGABYTE B560M DS3H Motherboard LGA 1200 Intel 10th/11th Gen B560 Micro-ATX
Ryzen 3600 Motherboard Combo GIGABYTE B450M DS3H, Socket AM4, AMD Motherboard w/
MSI MAG B460M MORTAR Intel 10th Gen LGA1200 DDR4 mATX Motherboard
ASUS EX-B460M-V5 Motherboard LGA 1200 Chipset Intel 10th Gen B460 DDR4 VGA HDMI
MSI B460M PRO-VDH WIFI MicroATX LGA 1200 DDR4 Motherboard w/ Wi-Fi & HDMI (FL)
