Op -
I'm reading all your posts and you are certainly being thorough.
However, the only thing that would convince me that this is not a chip isssue would be the following
You have 2 identical machines running under the same identical conditions. There is literally NO difference between the two machines. They both have a mod chip - one works and one does not
Simailarly you have two machines as above, but with no mod chip - one works and one does not
Under those circs then we'd start having an interesting situation, but you CANNOT get past, turn chip on, no connection, turn it off, straight in!
Anyway, I had an xecutor chip with on/off switch. Switch on, no connection, switch disabled, it worked like a dream
Then, for a couple of days, the dash was saying no x box live found, but Moto and Whacked still connected, but overnight, whilst I was still gettting the same message, I could connect via the games...
The ONLY difference I see now, is that the UL (upload) DL ( download) and P (ping) on the connectivity page WERE giving results when I was connecting, but are now just coming up blank
The impression that the machine is giving is that it isn't even trying
Cables connected
IP resolved
DNS sorted
X Box live not found
Doesn't even seem like the machine is trying to connect, hence my belief the account has been blocked, either in error, or by accident/design. It looks like MS had us connect for a few days to suss our setups and then caused the crash and burn...