In what order should iron be diagnosed?

Question

Iron

Good day,
The problem is the following, after replacing the motherboard and processor, the system unit
starts, glows, and so on, it does not display images on the monitor, if you pull out the RAM, it does not beep, the percentage and the motherboard are new, what can be and how can you diagnose? Unfortunately, there is no POST card.

Answer 1

check if there is enough power...

Answer 2

Connect the speaker to the motherboard, and then go to the Internet with a question about the model of the motherboard and the decoding of sounds.

Answer 3

если у вас нет запасной матери, проца, видюхи, памяти и пищалка не работает, то дешевле всего купить все таки пост карту, она стоит копейки
дешевые варианты по 600 рублей
vlpost-card.ucoz.ru/index/postcard/0-11