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Laptop power dies when plugged into the mains power

I have a HP Touchsmart  TM2 Laptop
Problem:  wont stay on
Checked whilst plugged in, it wont wont stay on and will turnitself off afetr 15.
Left  plugged in for two hours whilst powered off, then it worked fine and battery was fully charged.
Ran battery test, battery fine but system says  battery not connected
Online research says that older versions used  60w charger.   Newer  versions  needed  90w or bigger

Could it be that charger not working properly or this a lower watt charger from a different laptop?

Any thoughts?
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Gary Case
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