Computer won't turn on. Power Supply light is on

[Joey_15]

My desktop that I recently built wont turn on. Its only about 4 months old. It was working fine last night. I go to bed, wake up, try to turn it on and nothing happens. The power supply is receiving power because the light on the back is on. When I press the power button nothing happens. No fans lights or anything. Ive tried taking the RAM and GPU out and changing the RAM slots but still nothing.

 

[alexoiu]

Try testing the power supply: https://www.youtube.com/watch?v=5FWXgQSokF4
See if a fan connected to it does spin.