The drives are NTFS formatted drives with data on them from their previous installation. They worked fine when they were last used. I'll switch them out and hopefully that'll fix the issue.
I switched over the hard drive to two other drives known to be good at the time they were taken out of the previous computer. I know they are getting power as I can feel them spinning. I switched out the SATA cables. I made sure everything was seated properly on the board. Still nogo. Still getting the beeps. I assume they would be like the POST test for computers. All of the other things plug into the board and shouldn't keep it from booting, like the front usb, the fan, and the rs232 port. That seems to leave the board as the issue.
Brand new AI NVR bought November 2023. The one in the link in the original post. HDMI connection for the monitor. Using the included plug in mouse. Initial setup. I got it and changed direction so it's sat in the box until now. I sent a message to them through the site explaining what is going on. I'll give it a couple of days to see what they recommend.
3rd times a charm. I tried a 3rd pair of drives and traded out the monitor for a different one. I was able to get the nvr up and running.