The NICs should be initializing during post so that PXE can occur, are you seeing link lights on the NICs? Is this occurring right after the OS installation or randomly occurring later when the server is in production? Does the driver suite reinstall fix the issue permanently or is a temporary fix? What switch are they connected to? Are the NICs teamed? Do they have static IP addresses? Are they doing iSCSI? What version of the driver are you using?
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