Mainboard and cpu change

[Vinz163]

Yesterday I got a new mainboard (asrock b450 steel legend ) and a new cpu ryzen 2700x 
I changed them with my old cpu ( i5 6600k ) and mainboard after the changes I started the pc everything was working but the cpu cooler was not working and my screen was black.
After that I checked every cable on the mainboard and also the HDMI cable it was connect to the gpu and Monitor.
Today I resetet the bios with unpluging the mainboard battery and waiting for 30 seconds and then putting it in again.
After that the cpu cooler was working but the screen was still black... 
Pls help me I dont know what to do anymore

[SnowyMus]

Is it your Ryzen 7 2700X PC that is failing to boot? Sorry if this seems like a strange question, but I wasn't entirely sure what you meant.

[Vinz163]

5 minutes ago, Kavawuvi said:

Is it your Ryzen 7 2700X PC that is failing to boot? Sorry if this seems like a strange question, but I wasn't entirely sure what you meint.

No my BIOS Doesn't Boot I just got a Black screen

[APasz]

Are there any beeps, or any LEDs on the mobo that indicate errors?

 

Reseat and triple check every connection.

Also remove the gfx card and see if there's any difference in behaviour. Try with the RAM as well.

[YoFavRussian]

45 minutes ago, Vinz163 said:

No my BIOS Doesn't Boot I just got a Black screen

It really strange, I had to reboot a friends new Ryzen build three times before it actually fully booted, works fine now. But it's doing exactly what you are describing, try restarting it a couple more times.

[Vinz163]

14 hours ago, YoFavRussian said:

It really strange, I had to reboot a friends new Ryzen build three times before it actually fully booted, works fine now. But it's doing exactly what you are describing, try restarting it a couple more times.

But i cant restart i can only plug out the powersuplly

[YoFavRussian]

On 10/11/2019 at 8:02 AM, Vinz163 said:

But i cant restart i can only plug out the powersuplly

My friends wouldn't the first time either, had to pull the plug and reset it by holding the power button and then retry.