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04-18-2012 12:33 PM
remove the battery, plug in the power adapter and see if it will power up.
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Microsoft MVP 2013- Microsoft Windows Expert - Consumer
04-18-2012 10:07 PM
Have you changed any hardware components in your laptop? If yes, I would recommend you to remove it and change it back to the original setting and see if the computer works. If you receive this issue after hardware change, it probably is the new hardware not compatible with your laptop.
If there was no hardware change and you just receive this issue suddenly, please try to remove both the battery and AC adapter for a couple of mins. Then plug in the AC adapter to see if it powers up correctly.
If it still powers off in a few seconds, you may need to contact HP customer support for assistance.
Above is based on my personal experience, hope it helps.