bios POST signals?

Question

Iron

When I tried to turn on the computer, it did not turn on, and a slight crackling was heard in the area of ​​\u200b\u200bthe power supply, after another test run, it was decided to replace the power supply. Having connected a new block, the download started, but the motherboard began to emit one long and two short beeps, while disconnecting the RAM and the video card from the motherboard, the biosa signal did not change at all, although it should have changed. The question is, what part is still out of order? Motherboard model ASUS M5A78LM

Answer 1

https://www.asus.com/support/FAQ/1029959/
Since it is doubtful that this memory is dead, and the motherboard is completely intact, it is most likely that the motherboard is for replacement.