Solution to k7n420 not booting

My system turned off last week and refused to turn back on.   The power button would not work, but I assumed that the motherboard was still fine because while the PS was switched on, my keyboard still had LEDs lit.  I figured that this was probably a result of the options I had set to allow keyboard power-on.  Unfortunately, the keyboard could not power on my system either.  
I tried to clear the CMOS memory and restore the defaults, however, when i moved the JBAT jumper, it had no effect.  I will admit that i freaked out for a few hours, and even started shopping for a new motherboard.  
I found deep within a forum somewhere that it is uncommon but possible for battery jumpers to not be completely effective depending upon your BIOS chip.  This webpage suggested to remove the system battery for 20 minutes.  I did this, then switched my PS on, and my power button worked!  
I do not know if the 20 minute delay was absolutely necessary, but it is my experience that just the JBAT jumper did not do the trick.  I hope this is helpful to someone!

Yeap!...it happened to me as well in the past...the solution i found was to shortcut the ATX power connector on the motherboard while it was connected to the board. I used a small piece of cable to shortcut the GREEN with the BLACK lines at the back of the connector therefore forcing the PSU to power up the system. After that i went back to bios and turned the power on keyboard feature off. Last i removed the shortcut...

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