G62-229WM - Battery charges but computer won't start/run on AC power.

I've got an HP G62-229WM, running Win7 Ultimate 64 bit, that will only run on battery power.   With a full, or even partially, charged battery and the AC adapter not plugged in, the computer starts and runs just fine.  The little power icon down in the screens taskbar area shows the normal battery only icon and indicates the correct % of charge. 
When I plug in the AC adapter (original HP 18.5V 65 watt adapter that came with the unit) the AC adapter light LED (located next to the AC adapter plug-in port) turns white momentarily and then turns amber, which indicates that the battery is charging.   This is supposedly normal.  
When the battery reaches 100% charge, the indicator light turns white again, and remains a steady white, which means that the computer is connected to external power, but the power icon in the taskbar area still shows just the battery only icon and not the battery/plug icon.  The operating system does not recognize that the computer is connected to external power and thinks that it is running on battery power only.
If I shut down, remove the battery and plug in only the AC adapter and press the power button, nothing happens.   No lights, no fan, no disk spinning, nothing.   The AC adapter seems to charge the battery just fine (and the computer runs fine on the charged battery) but the adapter will not start or run the computer by itself.  
I first noticed this problem a couple of days ago when I was on the System Properties page and it said that the "Windows Experience Index" was 6.1 but that the rating needed to be re-assessed.   When I tried to rerun the assessment, it stated that the assessment could not be run on battery power only and that I needed to connect to external power.  Of course, the computer was plugged into AC power at the time which first alerted me to this problem.
Any ideas would be much appreciated.

Hi,
I see that a full charge results in only 51% of the battery capacity.  Your battery is going south. It would be great if you happen to know someone with an HP power adapter like yours to plug in to your noetbook. The AC adapter output is within 10% of 18.5 volts so it is OK. I suspect a charging and power management control chip failure on the system board is causing the issue.
Best regards,
erico
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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