Pavilion dv7 laptop ac adapter problem. It works, but Windows 7 does not recognize it anymore.

The ac adapter works, and the battery remains at 100%, but the icon never switches from battery to AC.  The laptop will not turn on without the battery and just AC, yet the adapter keeps the battery charged at 100%.  Windows 7 will not perform some of the updates when it thinks it is running on battery.
Any ideas?

I am having the same issue with my G61.  I apologize in advance for hi jacking your post and leaving such a long reply but maybe it will help both of us in the long run.
The problem started off by everyonce in a while my battery icon showing my battery needed replaced.  I ran the battery tool and it said the battery was bad.  I eventually replaced the battery to no avail.  Here is everything that I have done and noted while dealing with this problem.  After replacing the battery the battery tool would not run saying that in order for the test to work the AC adapter needs to be plugged in (computer will only work with the AC adapter plugged in).  If I am using the computer and the adapter happens to come unplugged it almost instantly goes into a permenant sleep and I have to hard reset and plug the adapter back in in order to use the laptop.
The icon at the bottom of the screen does not show the battery charging.  It only shows the battery in good standing and its current power level.  If I remove the battery it changes to no battery present.
Some wierd things that are going on are the computer will boot up on battery power alone but as soon as windows is loading at the desktop it will go back into permenant sleep and will have to hard reset.  Also the computer will not power on with the battery removed and the AC adapter plugged in but all my power indicators are lit up showing its getting power.
I just recently upgraded to Windows 7 Ultimate and performed all the updates thinking that maybe that would fix the problem.  But it did not.  Although now when I run the battery tool it does not tell me to plug in the AC adapter.  It goes through the process and tell me that everyting is OK and my battery checks out fine.
One thing that gives me hope that its a software issue is that I have no issue using the battery when running Windows in any version of SAFE MODE.  I can run it till the battery dies without it going into permenant sleep.
I have read that it could be a motherboard issue but not sure how to verify.  Any help to help us figure this out would be fantabulous.

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