I own a HP compaq (presario c500) - been just 6 months. The power signal continuously turns on and off when I switch the computer on. The screen is blank and there are no other signals such as battery/charger being displayed. I have tried removing the battery and connected the laptop to AC power only - but to no avail.
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I recommend you to get the Power Outlet at your residence checked as your description indicates that power is not being supplied from the power Adapter....
Do check it using the Power Adapter and pluging in at different places like your Office or friends residence etc...
Hope this helps..
Just repaired one with the same problem. I finally installed new power button board, and motherboard. good luck and hope this will solve ur problem. By the way try the new power button board first it may save ya the cost of a new motherboard. Joe
This happens because of static energy storing in the motherboard components.
We can try power drain to resolve this issue.
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 you have to contact service center.