Solid yellow light comes on motherboard when powered up

[Supertanks]

Hi Guys


I have built a small PC; when switched on the PSU; solid yellow light comes on the motherboard; the light stays on when I power up the PC; nothing comes on the screen.

I would appreciate anyone's help with this.

Motherboard is Asus Prime A320M-K


Thank you

 

[Supertanks]

Thank you for replying; I have a AMD Ryzen CPU and I am plugging into a HDMI port on my GeForce GtX graphics card.