HP Pavillion DV4 1123us power adapter problem

Hi,
After using the HP Pavillion DV4 1123us for two years suddenly I noticed that the power adapter is not supplying power to the computer and it is making some not too loud repeatitive sound. I replaced the power adapter with HP 90W Smart Power Adapter which worked fine for a few weeks and then I noticed whenever I connect this to the wall outlet it makes some repeatitive chirping sound and this is also not suppying power to the computer anymore. It behaves like this even when it is not connected to the laptop which indicates that there is some problem with the adapter and not with the internal powers supply of the laptop. It is so surprising that the replacement power adapter stopped working so early.
In my home all the other laptops are working just fine and and found all of them are two pin - only these two are three pin. Not sure if this has gota anything to do with this fault.
Any help on this matter will be highly appreciated.

Hi,
Please check your other post:
http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and-Software/Bios-Password-Forgot/m-p/326509...
Regards.
BH
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HP Pavillion DV4 1123us power adapter problem

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