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If push comes to shove, unmount everything and try breadboarding it up with the motherboard sitting on a cardboard box or something to prevent the back from grounding out.
Always keep it simple and eliminate as many of the variables as you can. Take the RAM off of the board so you just have the motherboard, CPU, and CPU fan attached. If the motherboard has a speaker built onto it, you should hear a lovely steady beeping pattern indicating missing/bad RAM. Add the RAM, and you should get a different post code saying there's no video (assuming this board doesn't have onboard video). Add the video card and plug a monitor into it and see what you get.
If everything is working outside of the case, double check how you're mounting it in the case and ensure there are no standoffs shorting anything out on the backside of the board. There could be a standoff there that you aren't seeing since there's no hole in the board there for a screw to mount.
I know most power supplies if you miss the floppy power connector by a PIN, the system won't power up. That might be something to look into as well. It's a long process, but if you try to go through it step by step, it'll help troubleshoot the process. Like I said before, add ram, test, add video, test, add HD, test, add CD, test, etc., etc., etc.
I still find myself doing that when I do any major computer work today..
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