Why does the black screen burn after assembling the computer?

Question

Iron

Hello. After assembling new components, a black screen lights up on the monitor. I tried to connect the hdmi wire both to the video card and to the mother. At the moment, the video card has been disconnected
Mother - msi m7
Processor - intel i7 6700
Bp - cx 600m

Answer 1

1. most likely the percent is not inserted correctly
2. power supply 4 pin or 8 pin, connected to the mother?
3. what is the speaker saying?

Answer 2

Is additional power connected to the motherboard?

Answer 3

https://www.msi.com/Motherboard/support/Z170A-GAMI...
here is the instruction. page 30
you have a bunch of indicators there and even have a Debug Code LED
turn it on and see what it says. we will investigate further