The only requirements is the devices listed above, if the system doesn't come up under that configuration then it is something regarding on of those specific devices.  With the diagnostic lights being out it is either the computer is in a normal off condition, or a possible pre-BIOS failure has occurred.  The Opteron 1352 does show as supported, but do you have the specific part number for it?
We're a nonprofit with very limited budget and we have a working PowerEdge T105 server. We'd like to protect it by acquiring a full set of spare parts. I bought a motherboard (0D682C), an AMD Opteron 1352 processor, a heatsink assembly (GP172), a processor fan (WP747), a front I/O control panel (GP461) and a power supply (L305P-01 NH493). I borrowed RAM from our working server. I connected a floppy drive, a SATA hard drive, a keyboard, a mouse, and a VGA screen (all known good parts), and put it together on the bench without a case. It turns on but won't boot up. That is, the power light turns green (but the four front panel lights in the GP461 I/O panel never turn on and off), the processor fan spins, the hard disk powers on and nothing else happens. I ordered another processor but it didn't help. Our production server has a motherboard part number of 0P957K, which is different from the 0D682C that I purchased. Could this be the problem? (The Opteron fits correctly into the 0D682C.) The memory is known good and I've tried another power supply to no avail. The floppy is never accessed. There is never any display on the VGA screen. Before I purchase another motherboard, is there anything else to try? Could the PowerEdge require its case to start up correctly? Any suggestions would be very much appreciated! regards, AndyA
PowerEdge T105 -- failed bench build