Both my brother and I started playing xbox at the same time tonight, he on an original xbox 360 with a wifi adapter, and I with an xbox 360 slim.
I had to download an update, he did not.
After the update "finished" it gave me some weird error saying something about how the update can't be completed. I was disconnected from Xbox LIVE.
Now I cannot even connect to my wireless router (it still shows up as having 4 bars, but when I test the connection, it always fails to connect).
I took my xbox to a different tv and finished the update by plugging in an ethernet cable, however, it will still not connect to the wifi router (yes, I unplugged the ethernet cable).
My xbox was working fine for months before this. It was fine yesterday.
I have spent the past 3 and a half hours working on this, please help.