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Try doing power drain by taking out the battery & keep holding down the power button for complete one minute to drain out the power from the computer components. Restart the computer after putting the battery in.
Try restarting the computer only with the AC power, without the battery & vice-versa.
That should resolve the issue. If the issue persists, then the only option is service center.
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sounds like power charger not working properly or cpu is bad. this will happen sometimes too. it will turn on stay for a few seconds and then power down to prevent damagel
here is blink codes to help trouble shoot the problem http://support.hp.com/us-en/document/c01732674#AbT2
HP.com
see your manuals and what the blink codes mean.
each PC has PDF manual that covers that.
blink codes are BIOS warnings.
to tell you what catastrophic failure happend
like low power
bad memory
processor dead
GPU dead.
and more, some have 12 errors possible (newer)
if the BIOS screens are dead, its lost power.
or one of the above.
I'm sorry to say this sounds like a system board failure. On my HP DV200t, a very similiar issue occured, eventually only the led where you plug in the power cord would turn blue. I replaced the system board and all the issues went away.
Hope this helps, and I am sorry to be the bearer of bad news.
That flashing usually indicates a battery/power issue. Could the battery be dead? And/Or the power cable? Normally the power cable has a "brick" in the middle, and that connection could be loose. In many cases that brick has a led light when it is plugged it. Does your machine have that light and if so, is it lit? Does the "charging" or "AC power" light go on when it's connected via the power cable? Lastly, try removing the battery entirely, and using just the power cable, to make sure the battery is not causing the problem.
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