error initializing PCI Express NIC bridge at startup Dell optiplex gx520

I keep gettting this error at startup error initializing PCI Express NIC bridge.  I have disabled the onboard NIC and tried restarting.  Stripping down the PC.  REsetting CMOS.  I give up.  It is still under warranty and Dell has already replaced the motherboard twice.  What is going on.  Dell wants to install a 3rd motherboard.  Not connected to any gig switches either.
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mkurtzhalsAsked:
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nobusConnect With a Mentor Commented:
>>   I have disabled the onboard NIC   <<  why? normally, even unused, it will not harm the operation
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phototropicCommented:
Is your pc trying to boot from a network?  Try disabling this option in the BIOS.
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