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There are 2 possibilities: First, your fan, air inlet and air outlet are dirty/dusty. In this case you can use canned air to clean them up. If the dust become a dust ball, then you may have to open the laptop's base or just need a tweezer to lift the dust ball. The second possibility is the fan is dying (broken). In this case, you need to replace the fan, and it is not easy (you need to disassemble your laptop) to replace the fan.
Most power cord ports are soldered directly to the mother board. Open this one up and see if it is a separate part or not. If it is, you could probably just replace the small part, but my bet is that it would take an entire system board replacement.
I see this same thing often, when people push in the power plug too hard, jostle the laptop around alot or even tried to force the wrong plug into the port---it sounds like you may have broken the solder on the mother board on the power inlet, There are 4, 6 or 8 solder spots on most power inlets, you may have broken one or more of them loose---take it to the shop if you are not handy with a screw driver and a soldering pen...
Srivastav,What you have described indicates that the charger has gone. And unfortunately these things can not be repaired. In the past two months I have had to replace three chargers due to spikes or high voltage. Too bad.
So, please replace the charger and see your laptop running again. And use a good voltage stabilizer that has cuts high voltage.
I finally managed to remove the cover and solder the broken wire. Works fine exept the keyboard, but that is a result of old soda spill. This computer has been used with external keyboard for some months. I cleaned the keyboard with luke warm water and placed it for dry for 36 hours, but there are still som keys that dont work and Fn seems to be constantly on.