Dell 6400 work power up..

i have a dell 6400 inspiron... its should 3-4 yrs since i got it...
it was workin fine till yesterday... i plugged in the power when it was still on and suddenly to my shock it went dead... not even one light was up... the loadin light off,the chargin light off,the startup light off and even the charger went off (green LED on the charger). so i switched off the charger and plugged it into another socket... n before insertin it to my laptop i switched it on and d green light was up... but when i plug it to my laptop it turns off....

as of now its completely dead... nothin is workin... is it d smps problem or somethin else....

plz do help...
thank u in advance...
 
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