PC won't Post

Hello,


I am building a new PC for a friend. This isn't my first rodeo. However, this is the first time I've been having this issue! We built the PC with a refurbished mobo and it didn't post, so we figured that was the problem. we went and exchanged it for a brand new one, however we are stilling having issues with it reading to the screen. We have tested it with different RAM, different Video Cards, even a different Processor (same socket as mobo, of course) all of which test fine in other computers. The monitor we are using works on different computers and different builds with the same card as the one were trying to install on the new computer. It is not a faulty monitor or cable, and all the pieces work outside of the new build. All the cords are connected, and all the power is connected.

The computer boots up, we can get the fans, led lights, mobo lights everything. i can hear it load up and the LED indicator on the mobo D4 (meaning its checking, initializing, memory). I'm not really sure what, if anything, I missed. Should I just try another mobo?