Desktop won't start. flashing green light

I have a 1318NX Compaq Presario SR which will not start!  There is a green light flashing on the back of the power supply; which is normally green 110V AC is plugged into it.  I tried the trick of the Start button while not plugging the power cord... no help.  I also opened the case and carefully got rid of any power cord of all internal devices... the light turns green only when I pull the main power of the motherboard!

I need to replace the motherboard?  Troubleshooting on hp.com site would indicate that the power supply is OK if the light is solid green.

Thanks for your suggestions,

Lou

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My wife's computer had the same problem several times. A solution I found that worked before was to unplug the power cable from motherboard and the power supply cable to the back of the PC and then connect the power cable and plug the motherboard power cable while holding down the power button. Scary, to say the least, but it worked, until one day I accidentally spilled the bad circuit breaker and then spend two hours trying the same solution with no luck and the Google search again. And here's what I found. It is the simpler solution even more cruel. It is simple and noninvasive and no matter how tech savvy you are. Take a blow dryer and turn it on to blow air at the rear of the power supply for a few minutes. When you see the light turn green, you're ready. It's worked for me after that it worked for a hundred others, maybe more. A look at 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 that appears on any site of HP. So don't waste your money on a new MoBo or PSU. All you need is dry hair of your wife.

Tags: HP HP Desktops

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