green led light question mobo

The green led when constant shows that you have the power to boot the system. If that sees fluttering the board is in suspension.
 
The green light being on shows there is power being fed to the board. When it is constant the power is adequate to boot your system. When it wavers or dims or even goes off and then on again the power level isn't reliable to run the system with it's various hardwares.
 
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