Question cold double post

Feb 10, 2020
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Hello
i recently brought the ASUS ROG Strix Z390-H and now i got the problem of a cold double post, the PC turns on for a sec, turns off just to turn on again after roughly a second.I have been having this issue since the first day that I bought my rig this happens only when there is no power into the system (when I turn off PSU)
I have tried to flash BIOS and enable the fast boot feature but nothing really changed.I really want to know if this a "normal behavior" form my motherboard because I dont really want to cause any hardware damage or something.



Maybe someone can help me fix this please?