just a mobo huh, no PC, there.
?
so what PC did it come out of???? HP what? desktop .
turns on, ok
will not recognize the disk, (what disk? what drive, what disk,??)
floppy, PATA HDD, SATA HDD, or CD drive.?
will not recognize, USB ports. (in BIOS or in Tne OS)
what OS, windows 3.1? what/? what Operating System??????
what OS will not shut down, and installed by whom and what media>?
take this unstated PC and install the OS, as it came new.
This PC is so old its not supported by HP, now.
so find and install disk (media) and re-Install the OS.
Fresh.
there it is, Google fails to find the match to any HP PC model name.
HP has zero data on it, now, its too old.