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?
IP4IT StaffAsked:
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nobusConnect With a Mentor Commented:
you can test if the laptop runs fine without a battery- from AC alone
you can also test if it runs ok from a well charged battery -  and for how long (this will indicate it's health)
you can also run thru a complete discharge and recharge cycle for the battery (should be done on a regular basis)
this will help you decide where the problem lies : the battery, or the charger - or the laptop charging circuits

you can always - as a last test -  reset the laptop to factory settings -  that should work; if you do not have hardware problems
Gary CaseConnect With a Mentor RetiredCommented:
From what you've described it's difficult to say, but it certainly sounds like you may indeed have an inadequate charger.    The charger should have its specifications on the side ... does it show the output voltage and current or wattage?
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