Care to share the Config along with PSU?
Is the PC in a Network?
This problem may occur for different reasons:-
1. Improper assembling. Some parts are not assembled properly, resluting current leakage.
2. Faulty capacitors in Motherboard or SMPS.
i think it's related to assembling then how should i correct it?
@tech_wiz - intel d915gav,512 mb ram, 250 gb hdd , PSU-techcom(450 watt bought it yesterday)
some motherboards have settings in bios to turn PC on as soon as power is provided. check for such setting in bios. else blame the el-crapo PSU.