I put a water block on it about 6 months ago. My cpu is a 5950X no intergrated graphics.
What motherboard do you use?
As you can check the user manual to see what the diagnosis LEDs say i.e. to see if the RAM or CPU are working properly, as if they are shot, then your system would not boot as well.
Some motherboards have diagnosis leds that change colour to point out which component is causing the non boot of your computer.