Asus Prime A320MK doesn't show video VGA

Oct 9, 2018
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Hello. I have a problem: I just built my new pc (it's the first I build) and I'm worry because it doesn't show any video.

The components are:
Asus Prime A320 M-K
AMD A8 9600
8 GB RAM Blackpcs
400W GameFactor 80Plus

I tried with a VGA screen.

To solve the problem I removed and installed again the RAM (at first I didn't installed correctly, but once I did it didn't work either). Then I realized I hadn't conected the 4 pin power for the CPU (but again, I did and still didn't work).

I don't know if I could cause some damage to the mother or cpu, because I turn on the computer without the 4pin power (only with the 24 pin power for the mother). Altought the motherboard seems just fine, it turns on leds and fans.

I will try to reset the cmon battery and to try with another screen. Any other ideas?