Question about HP Compaq Presario C500t Notebook

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Power button light turns on and off continuously with no other signals appearing!

Hi Guys,
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.

Will appreciate your assistance.

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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

Posted on Nov 14, 2011

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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

Posted on Oct 07, 2008

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Thunder55
  • 318 Answers

SOURCE: Power button has light turning on and off with no other signals !!

try,,holding the delete key down as it is starting up,,,will the computer boot into Bios?
do you see any information on the screen when you start the computer at all?

Posted on Jan 16, 2009

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Power button has light turning on and off with no other signals !!


try,,holding the delete key down as it is starting up,,,will the computer boot into Bios?
do you see any information on the screen when you start the computer at all?

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Contact HP this is a serious fault and it should still be in warantee so they should fix it for free.

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Hi All,


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.


Hope that information helped you!!

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Do u have installed recently, some software?
Try to boot up pressing the F8 button, when the menu appears select the option "Windows in safe mode" if u can boot to windows. View our software installed.
If it is not software try, boot whit the windows installation disk enter to the setup and select the option repair, u will go to a DOS prompted window (all black whit white letters) must appear "c:\"
used the command "chkdsk /f /r" let it run he will try to find any problem in the disk.

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