Hi Scourge,
No POST means there is a hardware issue.
If you have already replaced all the components without success, it is probably a problem with the motherboard. It might be a missing voltage rail for the CPU, GPU or RAM caused by a faulty cap or MOSFET.
If you have an EC problem, nothing will happen after you power it up, which is not the case. If you have a little knowledge of fault-finding, take the motherboard out and check for a short on each power rail. Take the resistance between ground (copper under the screws) and each coile. If any reading is near 0 ohm, that means the above.