Code 00 is usually CPU and/or PSU (power) related...
You do not mention if you are OC'ing that system... and how are you cooling the CPU?
If you do OC, then first completely power down the system (turn it off, remove power cable), then try it again... you can clear CMOS too...
You have had to put that 1080Ti in recently (max 1 month ago or so)... do you think that something could went wrong during that process? Like bumping the CPU cooler?
The reason I am thinking about it is if you moved the CPU cooling, you may have caused the socket pins to bend,,, that's a typical code 00...
Maybe check your CPU - re-seat it, re-mount the cooler...