|"I think he is from India"|
Calling the PSU an "SMPS" is a pretty good clue. lol. They're about the only people in the world that refer to a Power Supply Unit as an SMPS. And based on numerous posts from India over the years, that SMPS is probably cheap junk. Here's a list of several the garbage brands available in India that should be avoided: PowerSafe, iBall, VIP, Odyssey, Power3, Zebronics. The PSU that exploded was probably one of these brands. From what I've been told, there are quality brand name units available (Antec, Corsair, etc) but they're very expensive & no one is willing to pay the price.
The processor/heatsink was probably installed incorrectly from "day one" which caused the heat issues. That obviously was NOT a processor problem, it was an assembly problem. Whoever installed the heatsink on the processor did it wrong - too much paste, too little paste, no paste, heatsink not fully locked down, etc.
It appears that all the problems you've had with your system are related to poor assembly & the cheap power supply. There's nothing we can do about either one. You need to learn how to properly build a computer & you need to learn that "you get what you pay for".