hi guys
i have another weird problem again

when i plud ac,board turned on immediately,everything is true,even show display,but just for 2sec
and then it dies
just +3/5VALW is on


not respond to power key
when i press PWR_SW nothing happen on PM_PWR_BTN#
but when i manually connect PM_PWR_BTN# to GND it turned on for secends and die again
i program Bios&EC
i replace KBC but no change

there is no diffrence with or without cpu

i hope someone help me
tnx all

problem was here
PWR_SW# was 0.3V
i replace R35


nowPWR_SW#=3.3V and it works