I'm actually running 2 power supplies, a 600w (with the on switch shorted to on) for the card, and one 300w stock PSU for the rest of the system and the drives. Could there be some mismatch between the two causing this? The PSU powering the card is always on and doesn't turn on or off with the system.
It launches unraid just fine with the monitor being plugged into the gpu, but I will try with another OS.
UEFI causes a hang and a failed launch, a known issue with my system and unraid with seemingly no fix. Legacy is therefore the only option.
I have onboard graphics as well, with the same issue happening with onboard video disabled and while enabled.
The BIOS really only gives options for Date, Time, SATA Controller, and some other little various options but none including 4g or rbar, it is not the most modern system. It sure doesn't quit though!
I already tried the "pci=realloc" command and no luck, but will try again and maybe it will work!
I'll check to see if I got a dead GPU and haven't forgotten to plug something in properly, but I may just have to give up the whole "transcoding with a system that's now 12 years old" idea.
I will update with results.