I have been recently trying to build a computer and I have been having some issues. The problem is that the computer is not showing any video. The first time I booted it up, it worked perfectly. This was during an external build. When I put everything inside the case, it didn't post. I took everything out, and did a minimal external build, and still didn't show video. So far, I've tried swapping out quite a few parts. I've tried a different power supply, RAM, GPU, and even a different motherboard. Still, it is not posting. Is it the processor, or am I doing something completely wrong? Any help is appreciated. Thank you.