Satellite L40 will not recognize charger

I have Toshiba Satellite L40 and my laptop will not recognize my charger unless I put pressure onto the charger head when connected to the laptop, and this doesnt always work.
I am not sure if the charger is faulty, so Ive purchased a charger from eBay, but could anything else be wrong with it?
Ive read another old post with someone who had a similar problem, somebody replied to the old post saying that it might be the charger connector on the laptop, and if so this is connected to the motherboard?
Does anybody know if this is correct, or if it's something else? Any advice would be appreciated, as I don't really want to lose the laptop.
Thanks!!

ok. To put in a easier to understand my laptop will not charge propery with my charger unless i apply pressure to the charger when it's connected to the laptop. Im applying pressure to the top of the charger where in connects to the laptop, and sometimes have to wriggle in around. I'm going to try another charger which I have purchased from ebay.
I Would like to know if it could be anything else? If the charger dock is damaged on the laptop, will i be able to change just the charger dock, or is it a bigger job.....such as the motherboard????

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Satellite L40 will not recognize charger

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