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Pc getting no power when power switch depressed

Althought the motherboard light is on

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  • Kevin Shafer
    Kevin Shafer May 11, 2010

    You need to replace the power supply.

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  • 28 Answers

There is one supply in not active. either +3,+5, +12,-12 or power OK. It need to troubleshoot but if you tired or busy, better to replace the new one.

Posted on Mar 12, 2009

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Just about every power supply I've owned doesn't have a power switch. The power supply is turned on by one of the wires in the 24 pin connector. According to this it looks to be pin 16 and how to turn it on:

"Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF."

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to see if the power swithc is the problem-

first, try to isolate the wire that connects the power switch to the motherboard. once you have deternined where the power switch plugs, then remove the wires from the motherboard leads and try to short the leads by connecting them with a metal device like a screwdriver tip. if the switch is broken, it will boot when shorted with the screwdriver. if it still will not boot, then you probably need either a new motherboard or a new cpu.

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See if you plugged in the 4 pin power connector on the motherboard besides the main power connection on the power supply (usually black colored and its a plastic 4 pin connector)

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I have the same problem with Demension 5150. Replacing the P/S didn't solved the problem. When I connected the P/S the motherboard green LED light lighted up, however, no matter how many times I pressed...


For non-BIOS issues:

If you did not try to update BIOS before the problem started then try these troubleshooting steps.

1. Full power down. Unplug the power cord from the Power supply. Then hold down the pc power button (this discharges any residual power in the capacitors).

2. Open the case and reseat the graphics card, hard drive, and RAM.

3. Take out one of the RAM sticks if there is 2 or more. Swap the RAM sticks in different RAM slots. Try one stick at a time to see if you can get the PC to boot. If this works, then the remaining ram sticks are damaged.

4. Set the Cmos jumper to clear. Power up the pc. Power down the PC. Set the Cmos jumper back to normal position, power up the PC.

5. Unplug and replug all the power supply cables.

6. Check the powersupply function. Either by a powersupply voltage checker (20-25 dollars at local PC shop), get the supply tested at a PC shop (usually a free service), put the powersupply in a different pc, or try a different powersupply in the problem computer.

If the Powersupply checks out ok, then you will have to do a process of elimination to find out what part or parts are the culprit of the No-Boot.

Start by pulling all the ram sticks if you have not already. This is the easiest components to check and usually a culprit.

Take out one of the RAM sticks if there is 2 or more. Swap the RAM sticks in different RAM slots. Try one stick at a time to see if you can get the PC to boot. If this works, then the remaining ram sticks are damaged.

If it is not the RAM, you have to continue removing items such as sound cards, un-plugging hard drives and optical drives, other PCI cards. Do this one at a time until you find the culprit. If a POST screen, meaning you can see Anything from the PC brand name to Motherboard brand name appearing on the screen. The PC may not boot to windows, but it Does post at this point, and with that the problem is resolved. If windows does not load, then you have a new problem. Best dealt with asking a new question.

Good luck!
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If you still have no power and still have the light coming up on the motherboard then I think the motherboard may be bad cause that means something is shorting out the motherboard and not allowing power to go thru it properly.

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