QUOTE(marcozd @ May 5 2009, 02:56 PM)

Why all of a sudden would this be happening?
Difficult to tell. Maybe the NIC on the Xbox has started to fail, and drifted out of tolerance?
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Also, how do I check the duplex status of my computer? I am using Windows Vista Home Premium Edition.
I don't think you can - I was confusing Windows with Linux! Apparently some NIC chip utilities give you this information in Windows, but not all. Probably not worth pursuing if you have another Xbox to try.
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If I take the HDD out of the not working xbox and then install it in a different xbox that I know is working, will that fix the problem?
It might. You'd have to unlock it, then relock it with the eeprom of the new Xbox. You might have to change the kernel version in the softmod to match the destination Xbox kernel before doing the unlock and swap.
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And if I have the same problem can I assume that it is a software issue and not the xbox itself?
It's unlikely to be a software issue because changing the network connection fixes the problem. I'd do the swap first, rather than trying to second guess the cause of one of the possible outcomes.
