Cannot Detect Network

I just came home to visit my parents and my father cannot connect his new MacBook Pro OS X (10.5.6) to the airport extreme. I assume this is a recent problem and I believe he use to be able to connect it. I can detect and connect fine on my MacBook Pro (10.4.11) as can my mother on her MacBook. What makes it even weirder is he claims to have taken it to the apple store where they had no problem connecting it to their networks and I just brought it to my friend's house where it connected flawlessly to his linksys network. It also is able to detect networks in neighbor's houses.
I have attempted to manually type in the network name but it still can't find it

I have a similar problem which developed suddenly whilst I was away. My network is based on an Airport Extreme base station connected to a DSL modem for Internet purposes. Four Apple devices routinely talk to the Airport Extreme: my iMac, my MacBook Pro, my iPhone, and my Apple TV unit. The iMac is crucial because it is on it and its various associated external drives (2 USB plus one Time Capsule) that all my music, photos etc are kept.
My iMac is never powered down, nor is the Apple TV. The MacBook Pro is when not in use. The iPhone always goes with me. I came back from a week's vacation to find both the iMac and the Apple TV had lost my Wi Fi network. Powered down the Airport Extreme and back up. MacBook Pro and iPhone were fine and talking immediately. Apple TV could see the network OK and just needed the WPA password. But the iMac simply cannot see the house network at all let alone the neighbour's network which the other devices see without problem. I am mystified what to do next...

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Network Adapter Information
Adapter Name:          {B17D9219-7E1D-40CE-BAC6-420714253A52}
Description:          Bluetooth Device (Personal Area Network)
IP Address:          0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:          0.0.0.0
DHCP Enabled:          Yes
DHCP Server:
Lease Obtained:          Thu Jan 01 08:00:00 1970
Lease Expires:          Thu Jan 01 08:00:00 1970
DNS Servers:
Adapter Name:          {66304A8E-7EBA-4CAA-B2BF-A8AEF04C5A68}
Description:          Microsoft Wi-Fi Direct Virtual Adapter
IP Address:          0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:          0.0.0.0
DHCP Enabled:          Yes
DHCP Server:
Lease Obtained:          Thu Jan 01 08:00:00 1970
Lease Expires:          Thu Jan 01 08:00:00 1970
DNS Servers:
Adapter Name:          {43659E23-A7AF-4613-BF73-52663D28FCA9}
Description:          Qualcomm Atheros AR9485 802.11b/g/n WiFi Adapter
IP Address:          192.168.1.3
Subnet Mask:          255.255.255.0
Default Gateway:          192.168.1.1
DHCP Enabled:          Yes
DHCP Server:          192.168.1.1
Lease Obtained:          Tue Mar 19 20:53:56 2013
Lease Expires:          Wed Mar 20 20:53:56 2013
DNS Servers:          192.168.1.1
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Subnet Mask:          0.0.0.0
Default Gateway:          0.0.0.0
DHCP Enabled:          Yes
DHCP Server:
Lease Obtained:          Thu Jan 01 08:00:00 1970
Lease Expires:          Thu Jan 01 08:00:00 1970
DNS Servers:
Active Connection:          LAN Connection
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Online:                    Yes
Using Modem:          No
Using LAN:          Yes
Using Proxy:          No
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iTunesHelper 11.0.2.26 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
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iPhone 4S running firmware version 6.1
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