PC Powers On, No Display, No Beeps, Nothing

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I am having an issue with my computer starting up. It will power up, I hear the hard drives spinning, the fans all come on including the CPU fan. But I get no visual, no beeps. I tried to wait out around 5 min or so to see if it is going through it's startup process which would cause my mouse and keyboard to light up once in Windows at the login screen, but it never did that.

I tried to test a different monitor, a different graphics card and all variations between. I don't see the power signal inside the motherboard light up as it normally does. I secured all connections and made sure everything was as it should be. I came across the 12v power cord and when I unplugged it to look at it, it looked somewhat burnt brown on 2 of the sockets but the other two were not. Does this mean my Power Supply or Motherboard burnt out or is it something else entirely?

I am not sure what else to test to see what the problem is. Could someone assist me please?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.daniweb.com/hardware-and-software/hardware/threads/77087/pc-powers-on-no-display-no-beeps-nothing

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