Pc showing no signs of power

I replaced my power supply and motherboard. But it us still not showing any signs of power. Yes I also checked to see if my power cable is plugged in and if it's working too. Please help asap, I need to play Fallout 4.
 
  1. Does the PSU have a power switch next to the cable connector? This catches people off guard at times.
  2. Double check your front panel power button connector.
  3. Check to make sure your memory modules are pushed in all the way.
 
  1. Does the PSU have a power switch next to the cable connector? This catches people off guard at times.
  2. Double check your front panel power button connector.
  3. Check to make sure your memory modules are pushed in all the way.
Checked all of those. Still not working.
 
Do you still have your old power supply? You can use it as a temporary test. The odds are slim that both the new and old PSU would be bad.
 
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