Have you done a factory reset? If not do so if you have assist to locate and do the init setup.
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If I have two of the WD160GB drives attached(second one in drive bay 4 with the second +5/+12V cable lead, the unit will show 12.36V and never start spinning the drives and no power up at all.
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What happens if you use drive positions 1 & 2?
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If I start with a WD160GB in Drive 1 and 3x30GB Quantum as the three other drives, voltage starts at the 12.3, drops to 11.56 and then stabilizes at 11.81 after all the drives are spinning.
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I think the dropoff is 11.5 volts, if it drops below that the PS will die and the unit will not boot. You are real close to this value. Just out of curisity have you tried using an external PS (pc) (jumper the start). Then boot with only 1 drive connected to the factory PS. If you try this make sure you ground the 2 PS together, so they will have a common reference.
I suspect the power supply is bad. If you decide to open the PS up, look for bad cap's. These are the most common failure.
Are you connecting all of the cable when you try to boot? It is required for the snap to control the drives properly.
I suspect the power supply is bad. If you decide to open the PS up, look for bad cap's. These are the most common failure.
It is not a good idea tring to power on drives after the unit is up. These are not design for hot swaping.
I have booted 4 250gig WD SE drives in my 4100, so I know their capable of booting 160's.
I never heard of a non mod board not booting, just not stable.