PSU blinking green after failure on HP Pavilion a6257c desktop computer

I don't like the sentence you guru with this stuff, but I'm stuck... As a reference, you helped me a few years ago and I have not forgotten. In any case, my flag above (POWER 250 watt PSU) ran along well without ever clogging until 3 days ago. A truck pulled a power pole half a mile away and we lost power in the House for about 4 hours. I have indeed had the computer is plugged into a GFI power strip. He has apparently not helped, because when I went to turn on the computer, I have nothing. No noise, no beeps, nothing. Quite dead with nothing more than a green light flashing on POWER supply. I've seen this on other machines and I heard of all the tips and tricks to get a solid green light again and then the computer turns on.  I followed the most logical edge by disconnecting the main to the mobo card, while the power supply is connected, the led lights in green, and I plug the mobo connector back in and I can start the machine and it works perfectly. In fact, it stops, lights and works perfectly, as long as I do not unplug the power cord from the wall outlet (or power strip GFI in this case) I tried both. If I cut the power to the computer in a way for more than a minute or two, and then the green light on the power supply will flash again when I plug again.  I worked on the computer for several hours last night and he ran like he used to run. I left it plugged in all night and the light was still green this morning. I disconnected the power cable and made a pot of coffee, come back, plugged in and got the 'flashing green' again. I'd rather have the computer 100% good and power on any circumstances are.   With all your expertise, can you guide me on this repair? I would be certainly grateful and thankful for any advice to give me. Thank you in advance.

P.S. I have tried the red switch at the rear of the PSU without effect on the symptoms above.

It was a pleasure to be able to help solve the problem.

Best regards

ERICO

Tags: HP Desktops

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