[Max8]

The PSU out of the 4200 that hangs works fine in a working 4500...

So I take it that the MB or the backplane are having issues...

- during post I did not get the System Health Fail: Vcc -12.0V out of range
error obviously

and at this point I did get HDD readings that I did not get in the other unit;

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0680 ATA/133 Controller BIOS Version 3.2.08
Copyright (C) 1997-2003 Silicon Image, Inc.
Sil
Primary Master : Hard Disk 251.0GB LBA 16Sec Good On UDMA5 4
Secondary Master : Hard Disk 251.0GB LBA 16Sec Good On UDMA5 4

Broadcom NetXtreme Ethernet Boot Agent v3.1.11
Broadcom NetXtreme Ethernet Boot Agent v3.1.11
Copyright (C) 2000-2002 Broadcom Corporation All rights reserved.

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