Problems with Motherboard Socket AM3 GigaByte GA-MA790FXT-UD5P

[AVY]

Hello
I bought Motherboard Socket AM3 GigaByte GA-MA790FXT-UD5P + CPU AMD Socket AM3 Phenom II X4 955 BOX Black edition (HDZ955FBGIBOX) + RAM DDR3 4096M 2000MHz OCZ Flex EX (2x2048MB) Dual Channel Kit + Videocard PCI-E nVidia 9400GT 512 Mb Palit Super (NE+9400T-TD51) . I pluged its all.
BUT when I switch on motherboard, coolers are runnung, but on display I recived "No input signal". I changed videocard but the result is the same.
Can you give a hint what is wrong?

 

[Spydermag68]

I would check all power inputs to the board again and re seat the card.

How big is the power supply?

Welcome the Anandtech.

 

[AVY]

The power supply has nominal 400Watt
All inputs to motherboard arr correct (lamps on board are shining and coolers are woking)

 

[jackjack]

Do you have an 8 pin CPU power connector connected? If not , you might want to try that.. Good luck!

 

[Puffnstuff]

What ps do you have? It might not be able to handle the cold boot inrush current which is why it won't start.