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Present Signals

We have a customer that is putting 4 of our boards in a PCI system.
With 3 boards present it boots just fine, but with 4 boards installed it
doesn't boot.  The disk drive doesn't spin up, the graphics board
doesn't output a sync, there are no beeps.  About the only thing that
happens is the fan on the motherboard turns on.  The motherboard is a
Super Micro and the BIOS is AMI Plug-n-Play version 2.0.

We are working over the phone so it is somewhat clumsy.  We have had
them try different board combinations and different slots, etc. but the
problem remains.

One theory that came up was that maybe BIOS is deciding from the PRSNT#
pins that the boards are demanding too much power and it stops the boot.
 I wasn't aware of any systems that were using the PRSNT# pins to do
anything with system power requirements.  

Is AMI doing anything like this?

Thanks,
Jeff Dahlin
Appian Graphics

jdahlin@appiantech.com
www.appiantech.com
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