High pitched whine from netbook when power is plugged in. Does not charge when computer is on.

I have a specific power / charging issue On HP Mini Netbook 210-1077CA. Windows 7 starter ( I think)
With the computer OFF ...
When I plug in the power it gives a high pitched whine. Red battery light is on, showing it is charging. (computer is off.)
To test the computer I have turned in on after charging for a little while and the % of charge is increasing. Showing that it is charging properly.
HOWEVER,
With the computer ON
The battery light turns white and does not stay on, but flashes periodically. Its not a constant flash but a pause of several seconds between a series of flashes. The manual indicates a Flashing Battery light seems to indicate either going into a sleep mode because there is not enough battery power (however my power is at 14% normally this happens I think at 10%) OR as the manual indicates there is a problem with the battery.
I removed battery, removed power plug and then pushed power button holding for 15 seconds. No change in behaviour.
I also tried to boot the computer with just the power plug in and no battery. But it would not turn on. I don't know if that is normal or not?? Interestingly the White battery light, while trying to turn the computer on without the battery stayed white no flash. (but did not turn on either as I mentioned.)
I read a few posts that say that the whining are Capacitors doing some sort of harmonics. Although I have never heard this sound before.
Im sure that this problem is not fans or heat sinks etc. Since in only happens when the computer is off and charging. In my opinion its definitely electrical. The sound seems to be coming from the center of the netbook or the battery area..
So my conclusion is ...
1. Battery has problem and needs to be replace,
2. Maybe the AC adapter is bad, since it doesnt boot w/out battery (if it is suppose to ??) Also since it seems when I turn it on it goes from Red charging to white flashing as soon as it starts to boot. Could it be the AC adapter is not giving out enough power to charge and to boot at the same time.
Anyway can anyone help me on this issue. Im not sure whether to start by getting a new AC adapter or new battery. I would not like to buy new both and just throw money at it.
Maybe it is not either???
You help would be appreciated.
Regards.

I have resolved the problem.
I replaced the AC adapter. Everying works find now. I tested runing the computer without the battery, and it works. So I might add that a possible test for an adapter that is not functioning properly is to try running it w/out the battery. If it does not run its possible that the ac adapter does not work.
Thanks.

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