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    Reference your motherboard's manual, which will tell you what the number of LED flashes means. CSM [Legacy] Mode should never be enabled, as its sole purpose was to support distros that didn't support EFI boot circa <2017, emulating BIOS' 16bit architecture within a 32bit environment, and it will cause performance degradation (boot times increase, GPT can't be used, etc.).
    – JW0914
    Commented Jun 27, 2021 at 15:53
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    There are no LEDs on the motherboard. I meant that the keyboard lights turn on and off, meaning that the system might power on and off continously. And there is nothing about lights in the manual anyways, since they don't exist.
    – Feri Carnu
    Commented Jun 27, 2021 at 15:55
  • If a motherboard fails POST, it will output either a series of beeps or LED flashes to communicate what test during POST is failing - reference the motherboard's manual =]
    – JW0914
    Commented Jun 27, 2021 at 15:57
  • The motherboard doesn't have one of those speakers. I plugged I one from a very old pc, but it doesn't boot.
    – Feri Carnu
    Commented Jun 27, 2021 at 16:00
  • I read the manual. It says that it should beep once if there are no issues
    – Feri Carnu
    Commented Jun 27, 2021 at 16:14