HP G61 Notebook power problem

Hi there,
I'm having random, intermittent problems turning on my notebook.
It happens as I push the power button to turn it on or wake it up, the instant I release the power button it stops. After a few tries and also holding down the button for more than a few seconds it goes through its normal power up procedure...this happens whether I have the battery in the unit or not.
Note: The power cable/adaptor are fine, the LED is always on when plugged in.
Also, this may be related (or may not), I turned it on one day, and a steady, audible alarm sounded, until I decided to shut it down, removed the battery, restarted no problem, this was about eight months ago. Since then I have put the battery back in, no problems except for what I have just described above.
Hope this made sense.

My HP G61 does not power on either with the battery or without it. I tried the method or removing the battery and holding the power bottun for a minute and plugging the AC adapter without the battery,all was abortive. I don't what next step to do. Pls, help me out.

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