With horrible pc parts price I bought this Office PC with a Asus Prime B360M-K to upgrade as a gaming pc but the chiniese GTX 1650 Low profile I bought does not boot sometimes. It gives 1 long beep and 3 short beeps gap and another beep. card fan does spin all the time.
I’ve a similar board. Long-short-short-short means no graphics adapter detected, and then that pause with one short beep I think means no keyboard detected.
Edit: ASUS have stopped putting the beep codes in their manuals for some reason so I don’t know where one is expected to find this information out. It was in my manual but that’s a much older model.