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Originally Posted by horseman
More interesting that PPC Macs have evolved into Intel Macs that run (U)EFI and don't have BIOS per se!  |
Yes, indeed. BIOSes have evolved into EFIs, EEPROMs have evolved into generic NVRAM and DNS resolvers have evolved into finicky things that can be broken by parts of the system that used to be involved in just loading the boot code.
That said, Apple EFIs do include the ability to connect to wired and wireless networks and bootstrap an OS over the internet so I suppose there needs to be a DNS resolver in there somewhere.
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Even more interesting if the OP has effected a permanent solution by resetting his NVRAM. The symptoms he described imho point more towards the new "discoverd" that initially replaced the "mdnsresponder" service in first 3 point releases of 10.10
That has been redacted in 10.10.4 by regressing back to previous legacy "mdnsresponder" again.
So if the OP joins a Yosemite network at any future time then he may find that pre 10.10.4 releases may effectively cause "bonjour cache" poisoning in addition to a myriad of strange anomalies including WiFi connectivity issues.
Time will tell..... 
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Good explanation! If a little cryptic, as usual