My power supply doesn't seem to support my country's voltage.
If the country you plan to use your computer in uses a lower AC line voltage than what your power supply supports (typically a lower voltage), it is suggested to not use that power supply for your PC. Lower voltages require more current to deliver the same amount of wattage. The components inside the power supply may only be able to handle so much current, therefore the unit may become damaged from prolonged usage.
An AC input voltage difference of -/+5V is acceptable. Therefore, if your power supply unit has a 120V/240V switch and your mains provides 115V, it is acceptable to set the switch to 120V and continue using the unit.
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