No hdd activity no display and keyboard doesnt light up,no post, no beep codes

[devilwant]

m specs:
biostar tp45 d2-a7 ver6
dual core e5200
2gb ram kington
gainward hd4850 512mb
hitachi 160gb & 500gb hdd sata
dvd rom asus & dvd writer sony ide
bluestorm 550w psu
creative live 24bit soundcard


my system power on evthng is running inside the system unit but there is no beep codes,hdd activity,display and neither mouse nor keyboard lights!

i have already tried diferent vga card,memory,reset bios.
remove ide or sound card and still the same.

sometime the system would power and work perfectly bt sometime like a whole day it can stay lik that!

CAN YOU PLEASE HELP ME HERE AM OUT OF IDEAS?!!!
THNKS

 

[amnotanoobie]

Either low power/dead power supply or dead motherboard.