Dx4-1548dx notebook -power connector is not working.need replacement/ fixing? any idea?

This is my second HP laptop malfunctioning as many years.  Power connector (slot where you plug in power cord) goes off and on at will. Laptop totally useless if I cannot charge the battary.  Look like I have to toss the laptop.  May be somebody out there can help me save my computer.  Thanks.

Sir,
I tried out with another charger but of no use. Also I tried out with the following steps suggested by HP:
1) Flee power discharge.
2) Remove and reseat RAM/HDD.
1 thing:
Also, sometime back, I contacted a service center for this problem, and they informed me that there is a transistor iin power line of the laptop which is not working. And we need to replace the laptop's mainboard to rectify the problem.
Thanks.
Karthik

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