Desktop won't start; blinking green light

I have a Compaq Presario SR 1318NX which will not start!? There is a blinking green light on the back of the power supply; which is normally solid green when 110V AC is plugged into it. I have tried the trick of holding the start button while plugging in the power cord ..... no help. I have also opened the case and carefully removed every power cord to all the internal devices ................ the light turns solid green only when I pull the main power from the motherboard!
Do I need to replace the motherboard? The troubleshooting site on hp.com would indicate the power supply is OK if the light is solid green.
Thanks for any suggestions,
Lou
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My wife's computer has been having the same problem several times. One solution I found that worked before was to unplug the motherboard power cable and the PSU power cable from the back of the PC and then connect the power cable and connect the motherboard power cable while holding down the power button. Scary, to say the least, but it worked, until one day I accidentally flipped the wrong breaker and then spend two hours trying the same solution with no luck and Googling again. And here is what I found. This is the simplest yet crudest solution. It’s easy and non invasive and it doesn’t matter how tech savvy you are. Take a blow dryer and turn it on to blow air at the back of the power supply for a couple minutes. When you see the light turn green you’re all set. It's worked for me after it worked for a hundred others, maybe more. See the testimonials on this site: http://talk19.wordpress.com/2008/01/13/hp-m7088d-power-supply-led-blinks-green/. It’s a shame that nothing like this appears on any HP site. So don’t waste your money on a new MoBo or PSU. All you need is your wife’s hair drier.

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Desktop won't power on/Green light will light up a little/fan spins a little?

Trying to help a friend, with an HP computer. Forgot to get the model number. It won't start up, I can momentarily get the green light on the power supply to go on, and the fan runs momentarily. It won't start up.
Would you think it was the power supply or the motherboard? Any Suggestions.
Thanks Bruce

Hello brucefl,
I have read your post on how your friend's computer will not power on, and I would be happy to assist you in this matter!
Since the fan spins a little bit with the green light, I recommend following this document on Computer Does Not Start (Windows 7) or for (Windows 8). This resource should help power on your desktop, or specify if there is a hardware defect attributing to the issue.
For further assistance, I will need to know:
The Product and Model Number of your desktop computer.
The version of Windows you have installed on your computer.
If this is an on-going, or recent issue.
If you have added any new hardware or software recently to your computer.
Please re-post with the results of your troubleshooting, as well as the requested information above. I look forward to your reply!
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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Hello Falkurneeze,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand you are experiencing some issues with your computer booting up. What you are describing appears to be hardware and not software related. I would advise you to bring your computer into a local computer repair store and have them take a look.
I hope I have answered your question to your satisfaction. Thank you for posting on the HP Forums. Have a nice weekend!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
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Desktop won't start; blinking green light

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