Wont even boot

i have recently built a new pc and from what i can see ive installed everything correctly i have built 3 other pc’s so im prety sure its all connected fine but upon bootup i see this weird flickering i cant make anythin out on the screen whatsoever but i can tell it loads into bios due to the red and blue flickering goin on its alomst like ive connected somethin wrong or faulty hardware

the pc specs are

ausus motherboard p4s800
cpu intel celeron 2200 478 pin
256 mb ram
winfast gforce fx 5200

cant get to install anythin else due to the basics not loadin correctly
any haelp would be greatly appreciated
thx for your time