What could be wrong with the computer?

Question

Power Supply

1. I turn on the computer without a video card - there is no signal to the monitor and the speaker does not beep (AMIBIOS)
2. With a video card too - the speaker does not beep
I checked the video card - it is working, it means something with the motherboard.
I tried to connect another power supply - it's useless, the same problem.
Motherboard nvidia 7050 v2
.
.
took out all the RAM = the speaker does not beep

Answer 1

How to enable the integrated graphics card