Question Pc Restart after POST

Jun 8, 2021
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i have a ECS motherboard... my issue is, as i say in the title, the pc restart after POST screen, it doesn´t matter the boot devices, it restarts... i try reset CMOS, change PSU, change ram, change CPU.

after outdating the bios. I managed to make a single boot on a pendrive, after turning off to connect a disk to install windows, it started with the same problem, after that i update the bios again ... but it continues with the same

other detail, that single boot, was only possible with UEFI, if I put the boot in legacy, it automatically restart after the logo,

i try so many things, but i cant make it works.

sorry for my English... it isn't my native language