Could be a small crack or dry joint or faulty component on the motherboard or in the power supply.
To explain what happens is when you first start your pc everything on the board is cold and discharged.So when you switch it on for the first time some components get charged up and the tracks heat up which cause the metal to expand which inturn creates contact.
Then with second start your everyting is connected which cause the pc to start up normally
Most of these type of problems will get worst during winter time
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sometimes it doesnot restart then i have tap the smps, then the smps fan starts and then the entire systems again. without further restart. sometimes on sunday when the system is on for the entire day. the system restart twice on sundays.
i thought i problem might with the windows xp so i formatted it. i have installed new harddisk. i have installed new smps also. still the problems persists.
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