ok so, i have at&t wireless 2wire and we have a toshiba laptop and a wii already connect to it wirelessly and they work perfect.i just brought the new macbook today and it is not connecting.it sneses and shows the signal but won't connect to it.i plugged in an ethernet cord and it worked for 5 mins. but then it stopped working again.i just want to have my mac connected wirelessly.if neeeded to(i was going to eventually) i wouldn't mind setting the tshiba as ethernet wired and the macbook as wireles.please hlp me.