Question about HP Compaq 6720s Notebook

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Wont turn on blue led remains on

My hp compaq 6720s will not turn on, the blue power led remains on if the battery is in, if the AC is plugged in it still remains blue and if the battery is out with the AC in it is still blue, i have tried removing and replacing ram as i read on a hp troubleshoot page with no luck.
thanks for any help.

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If your notebook is in warranty then you can ship it to HP and if it is out of warranty then check the link below, you can purchase the power jack of the laptop from here.

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