This is very vague, could you give more detail? Date you bought it, etc.
Check for the following before you start:
Power button on the front of the computer
Power button on the back of the computer
Power button on the power strip/surge
If those are all on, try this:
Check for loose or disconnected power cables
Check the power supply voltage switch (should be on the back of your power supply) and change it to the legal voltage for your country (search on google)
Try out a different power outlet
If all else fails, you may have to buy a new power cord, but make this the last option