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.
MSI MAG B560M MORTAR Motherboard INTEL 10/11TH GEN LGA 1200 DDR4 MicroATX
MSI MAG B560M MORTAR LGA 1200 10th/11th Intel B560 Micro ATX Motherboard
MSI MAG B560M MORTAR WIFI LGA 1200 Intel B560 Micro ATX Intel Motherboard
MSI MAG B560M MORTAR Motherboard WiFi INTEL 10/11TH GEN LGA 1200 DDR4 MicroATX
MSI MAG B460M MORTAR Intel 10th Gen LGA1200 DDR4 mATX Motherboard
