|It's possible your AC voltage source has too high a voltage, but that's extremely unlikely unless you're in a rural area or unless your location has faulty wiring otherwise. |
If this is a desktop computer, the 115 / 230 slide switch, which is usually red and recessed, on the back of the computer on the power supply must be set to the voltage of your power source.
Check the current voltages in the bios Setup of the computer. If the readings for +3.3v, +5V, or +12v are more than 10% too high, you MUST replace the power supply if this is a desktop computer, and your mboard is probably already damaged.