Not even CMOS reset started up the machine... 50lb paperweight haha
Didn't think the CMOS reset was going to do much, with an out of zone setting you'll usually still get to POST before it goes tits up.
You are getting a critical stop at startup. It is either a faulty power supply, one of the 5V or 12V rails is over or under volt by quite a bit. Grab a spare PSU and just set it up quickly outside your box to test if you can get it to actually boot up to POST.
The CPU is unseated or a bad pin on the the M\B is causing an internal short. You will need to pull the CPU and inspect those little pins that are released as you close the latching arm on the CPU holder. Had one M\B that actually came from the factory bad and another one I kind of messed up and ruined all on my own.
A short some where along one of the power supply lines, check all connectors even those that are not plugged into something. See if a couple have their wires exposed and possibly shorting out.
You have something some where shorting to one of the M\B traces or grounding points on one of the pieces of hardware mounted to it. If nothing else shows up you might just remove the M\B from the case, and attempt a complete inspection to see if any of the traces got damaged some how and if you can get it to POST on the bench.
These kinds of problems are always a real pain in the ass to track down the cause of, been there a few times and had just about every one of the suggestions above be the root cause of a dead boot system.