Question about HP Pavillion s7420n PC Desktop
> bad power supply
Try an ordinary lamp in the wall-socket -- to make sure that a circuit-breaker inside your home has not "tripped", i.e., no power to anything that plugs in.
If there is an on/off switch beside where the power-cord connects to the power-supply, switch it to the "off" ("zero") position.
Unplug the AC cord from the power-supply.
While watching the fan inside the power-supply, and/or watching the fan on top of the CPU, plug-in the AC cord. One of the fans may "twitch", if there is power.
Flip that rocker-switch to the "on" ("one") position, and see if one of the fans "twitches".
Also, look on the motherboard for a small lamp -- it may go on if the AC power-cord is connected,
or may go on when that "back" switch is set to "on".
Try a different power-supply. If still nothing, then it's your motherboard that got "fried".
Posted on Nov 11, 2010
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Posted on Jan 02, 2017
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