I've a new 12" 1.33 PB with built-in airport extreme. am using a 3com wireless router at home. problem is the signal range is only 5' on my PB! i borrowed a friend's older 17" PB (1st batch when it first came out) and tried its airport extreme on my router and it worked fine! the range covered well over 20'! is there incompatibility problems with the airport extreme in the new PBs? or could it be settings in network prefs? HELP! thanks!