First of all, thank you so much for urs response.
My motherboard is MSI B650M GAMING PLUS WIFI
View: https://imgur.com/lVfaIqE
View: https://imgur.com/a/Lt2gSzK
View: https://imgur.com/W7M0918
View: https://imgur.com/InyP5To
From what I've seen it's a common problem with AMD. I built my new pc and when I activated EXPO the DRAM light stays on for about 1 minute and then the pc restarts normally and enters windows. Sometimes the CPU light appears red and the DRAM light appears orange, but even so after about 1 minute...