One laptop connects, one iMac fumbles

Hello Forum;
I've looked thru the postings for a solution to my issue, but not finding one, here goes....
I share (with permission) my neighbor's wireless signal. On my workdesk I have a trusty iBookG4 and a 20" iMac, both using this wifi signal with no interference from either my iPhone or Plantronics earpiece, which usually are switched off or kept at a safe distance. sometimes I run both computers but typically I just use the iMac.
Lately the iMac has been unable or extremely hesitant to grab the wifi signal, while the the laptop has no trouble finding it. I've emptied the iMac's cache but that didn't help. Neighbor has reset his Netgear unit but that didn't help. All thru this, the iBook hasn't wavered...while the iMac acts like a wifi pansy.
I opened the iMac's Internet Connect and find either a very weak or no signal. At the same time the iBook, from less than 12 inches distance, shows a moderately strong signal on its Internet Connect.
System Profiler info for the iMac: AirPort Extreme (0x14E4, 0x88), Wireless Channel : 11.
Any suggestions?
JV

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How is the wireless setup on the WRVS4400N? Which mode are you using, i.e. B/G/N-Mixed or other?
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