In dealing, today even, with the dreaded problem with no configuration issues, I’ve also seen this issue occur when a network has been affected by a broadcast storm. Essentially what ends up happening is the network is being flooded by another switch, kind of like a loopback into itself. (I know that sounds funny) However, the fix for this particular issue was to reset all mini-switches within the path of the network with a simple power down, power up. Then, as needed, reset the Layer 3 Switches if they became too bogged down by the broadcast error messages.
I hope this helps. The particular issue I saw with one of my systems is that the cable has a break in it somewhere. It had enough signal to boot the kernel and init.gz, but when fog tries to reset the device after boot up, the signal is lost and nothing can be found. Then we got the hdparm issue. Connected the system to a good connection from another area and all worked fine. It wasn’t the system, but the network. Check that this other system isn’t having many Multicast devices attached (iPads, Smartphones, Apple TV, etc.) Reset the switches, and reboot any miniswitches. You may narrow the problem down further this way. If your setup worked elsewhere, chances are it isn’t a configuration issue and I was just trying to help. I’m sorry if I lead you in the wrong direction, but hope that this helps you out.