Pc won't turn on

May 21, 2018
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Hello to everyone and thanks in advance for the help.
One morning while I was turning on the pc I mistakenly pressed the power button two times in rapid succession, and the pc instantly freezed during start up. From that event the pc won't turn on properly.
I press the button and the CPU fan and a light that's on the motherboard turn on but the screen and the keyboard don't show any sign of life. I already changed the ram and cpu to new ones. I sent back the motherboard too but they told me that it works properly and even sent me a video of their test. I checked the power source with a tester and everything seemed fine.
So, any suggestions? Should I try to change the power supply too? Or is there something else I can do?