Dell INSPIRON 1564, DOES NOT TURN ON PROPERLY.

[parthabose]

I CHECKED AS IT WAS TAKING POWER & CHARGE LED GLOW ONCE.IT IS NORMAL.
THEN IF I PRESS ON BUTTON, ON LED GLOW ONCE FOR 2 SECOND & GOES OFF.
BATTERY PORT VOLTAGES WERE OK, NO ICS WERE NEITHER SHORT NOT OVER HEATING.
I HAD CHANGED PROCESSOR, RAM. BUT IT WAS MOTHER BOARD FAULT.
DC SUPPLY WAS SHOWING 1.2 AMP CURRENT CONSUMPTION FOR THAT 2 OR 3 SECONDS.
VCORE, RAM VOTAGES WERE OK. THEN I FLASHED SP ROM NEAR IO CHIP.
PROBLEM SOLVED.MB LA PART NO DAUM3BMB6E0.