Question about HP Compaq Presario SR1750NX PC Desktop

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A power surge shut down the computer -- green light flashing

A power surge shut down the computer -- now the green light on the back of the CPU is flashing and I cannot restart the computer.

Thanks!

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  • Cynthia Medeiros Jun 24, 2009

    Hi pumpkinman,


    I was afraid of this.  Is it expensive to replace the power to the PC?  Or should we take it in and try to get the data off of it -- and then replace the computer?


    Thanks so much.



  • Cynthia Medeiros Jun 24, 2009

    Thank you so much!!  I know we should have been backing up all the time.  We will try your suggestions and look at a new PC.  Usually subscribe to Norton but then let it lapse (big mistake).  A free program would be great (I'd be interested in your recommendation). Anyway, you have been extremely helpful.  What a great service. Thanks.

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For those who have this problem:

I just had the SAME problem. In fact, prior to my power outage last night, my comp was shutting down after sleep mode on its own.

It is your POWER SOURCE UNIT. I am not a computer guy, and, until today, had never opened up a computer before. After several posts like this hinted at the power source as the culprit, I took the shell off my computer and figured out what the power source was. (it's the little box in the back of your computer that sends power to the different parts. it has a spot where you plug your power cord into. there is also a fan on it.)

I monkeyed around and figured out how to disconnect it from all of the different spots. I went to Best Buy and bought their cheapest one (which has more voltage than the one my computer came with) and took it home. A little elbow grease and the new one was in. My computer turned back on right away.

Hope this helps!
-KP

Posted on Aug 02, 2009

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  • HP Master
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Im afraid it has been burnt do to the power surge

Posted on Jun 24, 2009

  • Steve Sweetleaf
    Steve Sweetleaf Jun 24, 2009

    i would replace the pc.a repair shop will cost you alot to have it all done that being said a new pc would be your better route and probally cheeper.you can get the data off your harddrive.you can have a repair shop do it but u can also do it your self with a transfer cable .which you remove the hardrive from old machine hook it to this cable then to your new pc and get whatyou need off of it..And unless you have bank accounts and pictures then i wouldnt worrie about it.but if u do then u can get them.watch the repair shops theyll tell you anything to get you to put the money into it.Which in reality a new pc would probally be cheeper and you will have a reliable machine. update update bakup and back up again.on new system youll be glad you did.make sure you have good protection not norton or mcafee? need help with that let me know i know of some good free programs

  • Steve Sweetleaf
    Steve Sweetleaf Jun 24, 2009

    http://www.ccleaner.com/
    http://www.comodo.com/products/free_prod...
    http://www.free-av.com/
    http://malwarebytes.org/
    These are what i use and never have a problem with my machine they work very well and all are free. your welcome i hope i helped you have a wonderful day.steve.PS buy a good surge protecter they work wonders?


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During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.

POWER SUPPLIES HAVE AN INDICATOR LIGHT FOR A REASON.
REMBER - BLINKING LIGHT IS AN OVERLOAD OF THE PROTECTORS AND ELLIMINATING THE OVERLOAD SOLVES THE PROBLEM AND THAT THE POWER SUPPLY IS WORKING AND CONVERTING POWER.
NO LIGHT MEANS NO POWER OUTPUT AND THAT INDICATES THE POWER SUPPLY IS NOT FUNCTIONING AND NEEDS REPLACED.

Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

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