Windows 7 shuts down after sometime

[kaushik37]

I have an Intel Core i3 sandy bridge system with 4 GB RAM and Asus motherboard, and running Windows 7 Professional 32 bit. Last time, my 450 watt PSU got damaged so got replaced with a new one. Again the RAM stick had got damaged so replaced it with a new one. Every time I installed a new component I have reinstalled Windows.

Recently I got a problem that Windows shuts down automatically after a few seconds from starting the PC. How to check the fault? Please suggest me in detail and step by step.

 

[Ironsounds]

Hello... You do not have to re-install Windows when changing parts... How far do you get into the Windows Startup screens? what info do you see?

 

[kaushik37]

After welcome screen, comes the desktop screen for a few seconds and then shuts down automatically.

 

[Ironsounds]

Hello... 1) Insert/Boot your Windows Disk, and Run a repair with the Tools on it.
or... 2) Delete the partitions on the hardrive, Re-boot and Re install Windows.
or... 3) Safe Boot into Windows and inspect your Hardware configuration.

 

[xLei]

Try removing the RAM stick and replacing it securely making sure the clips slide into place.