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Power light flashes and computer turns off

Hi....I have a Compaq Presario SR1838NX. When I push the power button to turn it on, it flashes green for about 5 seconds and then automatically shuts off. It never completes the power up cycle. It's only 3 years old. Any suggestions? Thank you for any help.

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  • Kimberly Roberts
    Kimberly Roberts Jan 24, 2009

    Power light on the front

  • Kimberly Roberts
    Kimberly Roberts Jan 24, 2009

    Power light on front

  • Kimberly Roberts
    Kimberly Roberts Jan 24, 2009

    I have already replaced the power supply with no luck

  • BrandonSH Apr 12, 2009

    We have the same problem with our HP tower.

  • 1r1sh May 11, 2010

    More info needed, power light on the front? or on the monitor?

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  • 23 Answers

This is a 1,2,3 item. If it is not the power supply, the cpu or motherboard are the next likely culprits. Generally, if the power supply is OK, the pc would have the fans running and you should be able to open the case and check the North Bridge, the large chip on the motherboard near the cpu and the cooler on the cpu itself. If they are both still cold, it is most likely the mother board.
It it were the cpu, it won't post, but you should still be able to feel the heat with the back of your fingers, just to be safe and touch it quickly so you don't get burned.
You can also try to remove the ram and try to reboot, if you get a steady series of beeps, you can add 1 stick at a time and reboot just to try to elimanate ram as a potential problem.
My next step would be to remove all of the other cards and add 1 at a time and reboot after each card, I probably removw the 4 pin connectord from the dvd/cd hard drives also ans add 1 at a time.
I know this sounds like a lot of work, but this is how I troubleshoot pc and telephone systems for the last 25 years.

Posted on Jan 25, 2009

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Looks like your power supply's failed. The green light on the back of your power supply is just a neon light that just confirms that the power lead is OK, it does not relate to the status of the power supply! Try powering it up with another power supply, or replacing the power supply.

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1#turn off the computer and uplug the power cable from the computer and then hold the power button for 20 second then turn on the computer and the momment you back to desktop screen
go to download driver from hp site and here is the web site http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=pv-43507-1&lc=en&dlc=en&cc=ca&lang=en&os=228&product=1841849 and restart the computer .

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HP/Compaq has had alot of power supply issues with this series of computers. Do you have another power supply you can try in this system? If the light is flashing rapidly, it is usually a power supply. Fairly cheap and easy to replace.

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get yourself a themaltake ps

make sure you remove the old one and take it with you to the shop or get the shop to do it for you if you dont have the expertise yourself.


hope this helps

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Sounds like the hard drive has had a failure, you need to get a replacement one, and reinstall it, along with the opperating system, and any other programs that were on the old one.

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Please follow the instructions listed at this link from HP/Compaq: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07173&lc=en&cc=us&dlc=en&product=92867&rule=43951#bph07173_determine

2. Reset the power: with the power cord unplugged, press and hold the power button on the front of the computer for 5 seconds. Continue on to 3,4,5 ect. If PC does not start up.

Don't forget to vote! Good hunting.

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