I had random shut downs and spent two days trying to sort it out. it was only the dicky psu. Get a new one before anything else. Mine only cost £20.
Poor psu's cause weird and wonderful effects to a computer. Computers should be sold with a spare! Psu fail gradually unfortunately.
this is satya.
i am using windows-xp s2 in my computer ,but it is shutting down randomly, without any msg or warning. can u plz suggest me what to do, should i install windows-xp windows again to my compuetr by formatting d previous one......