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Look where the plug goes in There will be a C shape with a dot in the middle. Follow the line attached to the dot and you will see a + or - which is the polarity. Next you need to know Voltage. Look in the same area, or on the label for this info. If there is NO info by the power plug, it might be AC, which has no polarity - just plug it in. The label may have this information and will say something like 12VDC or 12VAC that is the key. DC Matters (+ and -) AC does not.
Why did you have to buy a new adaptor? Did it suddenly stop working or was the problem intermittent?
It's my guess the adaptors are fine - very unlikely all three are bad - It's the connector in the laptop that's the problem - it's loose or was pushed too far in at some point so it can't make a tight connection. A good tech should be able to solder it on the inside. Hopefully, you can return at least one of the adaptors.