Booting Problems-Orange Light On

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I am having problems with my computer not booting up on occasion. There is a
steady orange light on.

Dell mentioned removing residual power by unplugging everything & holding in
power button. This is to clear residual power from system. Then replugging
all cables/cords. The computer then booted up. Hopefully this will "fix"
the problem.

Can anyone explain "why" this happens and if it is truly a complete "fix"?
.

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