Did you ever figure this out? I’m having very similar issues and think it’s a problem with the cpu socket connection. Very similar errors and no boot after taking off then stock hinge bracket and replacing with the thermalright support bracket. I think the socket pins were bumped and a few were very slightly off axis which I extremely carefully straightened (barely moved them) and even though they all appear straight now I still am getting no boot. I actually think that somehow the pins got pulled a bit when I pulled the cpu out. ******* annoying that my 1000 dollar motherboard was this fragile and is now kaput,put a brand new motherboard in.. booted up on my test bench no issues, even on a old bios.. moved it to my desk and will not boot any more. unplugged everything nothing, put back on the test bench and nothing. now.. gives me random errors. from cmos error, detect hdd and post error, i flashed to the newest bios thru the flash back button still nothing..