Why is there no signal on the monitor?

Question

Iron

Good afternoon! the trouble happened in the morning, the PSU burned out, bought a new one, installed it, everything started up. But another frightening misfortune appeared, there is no signal from the video card. I've tried resetting the bios, changing to different graphics cards, trying different cables, bringing a monitor from another room, but still nothing. at the same time, one of the video cards with additional power, if it is not turned on, then the bios starts emitting one long beep. I also tried to disconnect everything from the computer, including the hard memory and the drive. Is the Motherboard dead?
motherboard M5A87

Answer 1

without vidyuhi 4 beeps?

Answer 2

one of the vids

It makes sense to try another input and another vidyuhu.
Or leave just one.
You can also specify a detailed computer configuration, so the chances of determining a malfunction will increase.

Answer 3

Try to distort the memory. It often happens that when installing a PSU, memory goes away.
There are several unpleasant options, such as:
1. The PSU burned the motherboard before death
2. The power of the PSU is not enough for the normal operation of the PC