|"I've done almost every troubleshooting I could find.... only problem is the RAM"|
Why are you guessing it's the RAM? Bad RAM causes a beep code. If you're not getting any beeps, the RAM isn't the problem, it's either the board, CPU or power supply.
Did you take the board out of the case & benchtest it? Are you sure you installed the CPU correctly? What about the heatsink? Did you use a thermal pad, thermal paste, or no thermal material? If you used no thermal material or too much, it will prevent the system from booting. If you have the motherboard standoffs in the wrong place(s), they will cause a short on the underside of the board & prevent the system from booting.
Take the board out of the case & set it on a piece of cardboard. Make 100% sure the CPU is properly installed, along with the proper amount of paste. All that's needed is a tiny dab in the center of the CPU, approx the size of a grain of rice. Do NOT spread it around! Just set the heatsink on it & lock it down. Then install ONE stick of RAM. Connect the power supply (both the 24-pin plug & 4-pin plug), connect the monitor to the onboard & connect a PS/2 keyboard. That's it - nothing else! Plug the power supply into the wall outlet, turn on the monitor, then fire up by pressing the Power-On button on the motherboard. Post back with the results.