Question about HP Compaq Evo D310 PC Desktop

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HP Compaq Evo D310 Desktop. After connecting the mains supply to the desktop and swithing the power on, nothing happens when pressing the power button on the front of the unit. I notice there is a small red switch next to the power input does this have to be switched!

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  • joecoolvette
    joecoolvette Aug 05, 2010

    Some Power Supply's have an On/Off rocker switch. I for On, and O for Off. Power Supply's generally have a Voltage Selection slide switch. The Voltage selection is either 110, or 220. The switch is slid, until the appropriate voltage is showing. (Computer unplugged from power before doing so) USA uses 110. Most of Europe 220. Newer Power Supply's of better quality, do not have a Voltage Selection slide switch. Circuitry inside automatically detects what the Voltage is, when the Power Supply is plugged in.

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  • HP Master
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That switch is there to select between European and US voltage - if the pc has worked before then leave it as it is. Change it to the wrong setting and the power source will be fried.
Your pc doesn't start because you have a hardware fault.  Disconnect the data cable from the hard disk and try again. Next you must test the power source itself , outside of the pc - take it out then connect the green wire from the big connector to the black wire next to it; if the fan of the source doesn't start then it's fried, replace it. If it does then you must try the other components. If you haven't done that before , or if you don't have other components to swap for testing ,  then it's time to take it to a shop, nothing more you can do to it

Posted on Aug 06, 2010

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