Well i re-ran all the cables, reinstalled the fan wall, triple checked all the connections and it instantly beeped constantly the second i turned it on (it had been off for 4 days, so overheating seemed very unlikely). I tried a bunch of different headers for the AIO but eventually I just let it run as I was messing around in the IPMI (and cause it seemed to be booting effectively and didn't even feel warm). Well low and behold before unraid GUI could be accessed the beeping stopped and it's been running for over 2 hours without any further beeping. My server-related discord server suggested I update the BMC (and possibly BIOS). But personally feel I should rebuild the array first but I'm TERRIFIED. Can i just confirm with you that this are my steps?
select no disk on both the Parity and Disk1 then
Start the Array
Stop array
Reassign both disks to their previous slots
start array again
finally sleep easy?
I simply can't select "no device" and start the array unless someone smarter than me tells me that's the correct move.