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HP Pavilion a706n Windows XP power failure

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Had been operating normally until a loss of electrical power for an unknown period. At next turn on would not function. LED on power supply blinking. It is on a surge protector. Removed and opened power supply. Cleaned with air vac and brush. Very dusty. No change in operation. Removed all power connectors and applied AC. LED now steady on. Reconnected plugs, one at a time, removing AC each time and leaving large mother board connector for last. LED remained steady on until large connector on mother board was installed. LED again blinking. Removed large connector, applied AC power then installed the large connector. LED did not blink, power switch functioned normally and comp. booted perfectly. Have shut down and rebooted many times without a problem except when AC is removed for more than two or three minutes. By applying AC power with mother board disconnected and then installing the large plug with power on, it works perfectly until the AC is again removed. I am quite sure this is a no no procedure but it did not blow up as yet. :) Do not know if battery condition relates to this problem. Have not changed it. Test OK but could be bad.

This is my grand daughters homework machine. Help

Thanks, hefe
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