I guess this goes here. It's neither a NuBus or a PCI Mac. It only has PDS.

5200/75 LC shows question mark booting from hard drive.

When booting from Mac OS 8.5 CD, it displays the Happy Mac then plays only the last half of the LC chimes of death and then freezes (still on the Happy Mac).

It has the sticker indicating having been repaired under the old Repair Extension Program for 5200s.