Brent,
as to hardware, the Network server is pretty similar to the Power Mac 7600, such as PPC 604 132 MHz, SCSI hard disk and CD-ROM, ADB bus, AAUI ethernet using a transceiver for either BNC or 10BaseT media.
Maybe you could try to boot with an original Mac OS CD from a 7600 or 7300 (i.e., something like 7.5.5) just to get a chance to diagnose the hardware?
Of course, I am aware of the Network servers running AIX usually, not any version of Mac OS. Also, there might be a special ROM on the motherboard that makes booting from a Mac OS CD impossible.
Good luck,
Walter.