6735s AC adapter and/or battery problems?

Hi all.
I have an 11 month old HP Compaq 6735s laptop which has up until now been a very reliable machine. It came with Vista but was upgraded to Win7 when it was released.
Approximately 2 weeks ago I started getting the message when on AC power that the "smart AC adapter is not providing enough power" (something like that anyway!) And even though plugged in would switch to battery power only. Restarting the laptop always "fixed" this.
Then about a week ago the laptop refused to work on AC power at all, only the battery. Of course the battery soon became totally discharged so I removed it, and found that the laptop works fine on AC power with the battery removed. I have tried another identical HP AC adapter to mine and the laptop behaves in the same way. So I'm kind of discounting the AC adapter. The guy at the computer store where I borrowed the AC adpter to test it claimed it was the power port on the laptop that was the culprit, but I doubt this as of course the thing runs just fine on AC without the battery...
Strangely though the thing will run fine on AC power with the battery installed if you first remove the battery, then insert the battery once Windows is running, charging the battery also - that is until the message about the smart AC adapter not being powerful enough pops up (usually after an hour or two of use). I've run the battery test and it gets a clean bill of health. So I'm at a loss really. I don't like running the laptop without the battery in (don't know why, as I know it won't hurt it!)
There is just a month left on the "warranty" so I'm thinking perhaps the phone calls need to start, but I thought I'd ask on here in case theres a known fix for this that I can do myself (though much Googling hasn't revealed anything) as I don't like the thought of being computer-less for a while as this is the only PC I have.
Thanks in advance to anyone who could shed a light on this strange problem
Regards, Bob

My problem was solved by adjusting the way power cord is put in power port. I think it was pulled down earlier more than once. To fix this, I inserted cord, pulled it up so it remains inserted at opposite angle.

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6735s AC adapter and/or battery problems?

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