How come my PC and my little brother's PC boots like this? Also, is it safe?

[tml4191]

https://youtu.be/hQBniz7x5QQ

[Arne_Saknussemm]

Yes, it's normal, yes it's safe. The double boot on "cold boot" i.e. when all power was removed from the board, is just the board resetting and re-training RAM for instance.

[tml4191]

I'm glad to hear that. Thank you for answering my question!