Problem solve ho gaya.... PC ko kholo pura. Uske upar jitna bhi micro dust chipka hua he motherboard ke capacitor circuit parts me wo sab ek chota painting wala brush le kar acche se saff karo. Fir acche se saara chipanke wala dust blow kar ke bahar nikalo. Ye same process SMPS khol ke bhi karna padega. Fan vaegera par chipki hui sari dhul hata do. Aur jo start push buttons he unke contact aur wires sab clean karo. Fir start ho jayega normal. Mene 2 din pehle ye kiya, ab se sab sahi ho gaya he.