Just in case
something got wiggled, try unplugging the power supply again, press in
the power button and hold it in for a count of 10 seconds to dissipate
any internal power, then open up the chassis again. Make sure that all
the power connections that run from the power supply are seated tightly
into the connectors on the board. Take the memory out again and make
sure that you re-seat it tightly.and for more info http://tinyurl.com/m7ghqz
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