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Most likely problem is a video type mismatch. Your description makes it sound as though you understand the case build process well enough.
The motherboard you purchased has a DVI-D output. It requires a special cable. There is no adapter that will convert DVI-D to any DVI analog signal. There are some shady manufacturers that sell them (they look good but don't work), but unless you buy a cable that has a digital-to-analog converter inline, you will need a monitor with a DVI-D connection in order to see any video.
The failed boot could be from a number of issues, mostly hardware failure. I would start with the processors. If the system is using 2 cpu, I would remove the 2nd cpu, reboot checking to see if you still get the black screen. If you do, remove cpu 1 and put cpu 2 in cpu 1 slot are retry. If the system boot, replace cpu 1. If not, move to check ALL the memory cards installed.
This could be a lengthy process. What hardware/software changes was made before the issue started? Worse case, the server may have reached its end life and need to be replace all together. I would also recommend reaching out to HP support for more information about your system.
If there was a video error generally you would get beeps that are similar to removing the memory.
when this happens you are looking at a failed CPU or Motherboard. For the system to get to the POST it has to get past the CPU hence you have no beeps.
First thing would be to clear the bios and cmos. use the jumper and remove the battery.
If clearing does not work then you would remove the cpu, turn the system on, then off. then reseat the cpu and try it again (remember heatsink as well never turn a system on without the heatsink on it)
You have voice message telling you CPU test failed , but does it BEEP at all ? if you have a Beep code then replace the CPU fan ( when CPU gets too hot it will either shut down or the PC will not boot up at all )
The answer is to get hold of a high-speed case fan. I used a Scythe s-flex 80mm which has a +/- 5% RPM of 2800. rearrange the pins or use a choc-block such that yellow -> black, red -> yellow, black -> red. Hey presto.
Works for me.
The CPU failure was possibly due to a Power Spike, if that was the case then the Memory or Motherboard may also be damaged, it may be best to test the CPUs and the memory on a known working system, to see what is working & what is not