for a few month now i have a problem withe the wireless, something wrong with their system which made people unable to connect to wireless when using hdmi cable.strange right ?
for me, i have fixed mine, but it was a complete miracle, i still have no idea how. i have searched the xbox support site and found too many people who have the same problem. as far as i know, they just tell you to buy and another cable and good luck ! that's all. but i have also seen some people will real constructive advice and they know their stuff.( they deserve a mention, not all support team are moron ) my point is that the xbox 360 slim clearly have some issue. and their attempt to fix it was futile.
( p.s pardon mine grammar and spelling ETC )