Pc wont boot

[spartan91]

D ram led on mother board blink on and of pc turned off automáticaly all ready try 2 CPU 3 rams mother board its new out of the box

 

[Colif]

can you give us more info?
What motherboard
What CPU(s) have you tried?
What ram sets?

was it same motherboard every time?
Have you updated BIOS on it? Many new boards let you flash BIOS on them with only a PSU attached, no need for a CPU.

If its an AMD Board, were the rams on the QVL of motherboard or tested by makers of Ram to work with the board?