new stuff, PC won't start

[ian270998]

just installed a new motherboard,processor and Ram, but when the power button is pressed, it won't start.
tried with the old motherboard and it started!!
even tried with touching the power pin with a screwdriver.
HELP PLEASEEEEE!!!!!!!......

 

[CountMike]

You'd have to list main parts but there could be only few reasons, Some part is dead, something not compatible or you put it together wrong.