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A power cable connects from the power point to the power supply where it supply's the motherboard and other components with power. The computer power supply is placed inside the computer case generally near the top of the case. With a power supply tester all you have to do is connect the main power connector and the processor connector from the power supply to the tester. When using a volt meter you will need to jumper the green wire to one of the black wires using a small piece of wire.
In general any voltage more than 5% off in either the positive or negative is an indicator of a bad power supply.
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This item will be shipped through the Global Shipping Program and includes international tracking. Will usually ship within 2 business days of receiving cleared payment - opens in a new window or tab. Buyers paid using Paypal: We can only ship to the address specified on your Paypal transaction. Note: Shipping charge listed includes the cost of environmentally-friendly packaging and handling. Without the power supply a computer is useless as it is just a case full of metal and plastic. Once that is done you can apply power to the power supply and begin testing each colored lead.
You should be expecting voltages of +3.3, -12, 12, -5, and +5 if you are getting numbers outside of the 5% margin on those then that confirms the power supply is bad. Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. Contact the seller- opens in a new window or tab and request a shipping method to your location.

This is because it's much faster, simpler, and there is less risk of having a component burn out or getting a nasty shock yourself. Be sure sure to document each voltage, and then review them when complete for identifying issues. I personally hold power supplies closer to 4% as at 5% you will have issues and I expect small drops to happen with power distribution.
If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. A volt meter will give you more information about the power supply, but in most cases is not needed.
The only time I use a volt meter is when I suspect the issue could be the power supply even when my power supply tester shows that everything is fine.

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