Airport doesn't work after firmware update

Hi.
I was using my home wireless network when the Software Update suggested a firmware update to my Airport. I did it, but since then it doesn't work any more. I mean, the Mac can't find it and it keep flashing the yellow light.
Have this happened to anyone else?
Thanks.
Best regards,
T

Try shutting down the DSL modem and your AirPort base station. Leave them S/D for about 5 minutes, then start the DSL modem, allow it to complete its test cycle, then start the AirPort base station.
Repair Permissions - /Applications/Utilities/Disk Utility.app. Start Disk Utility, select your HD and click on Repair Permissions. When finished, quit Disk Utility and then restart your computer.
Go to System Preferences/Network/AirPort
- click on the 'Network Name:' roll-button, select 'Join Other Network...', enter 'Network Name and select the security type you are using, and finally, enter your Password and click 'Join'.
- click on 'Advanced', TCP/IP and confirm that 'Configure IPv4:' is set to 'Using DHCP', click 'OK'.
- click the 'Apply' button and exit System Preferences.
If the above does not work then a factory reset of your AEB might be in order. The setup manuals for all AEBs are here: http://support.apple.com/manuals/#airport

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Airport no longer working after firmware update

Before i get to my question, i think that it is necessary to give a bit of background as to why i have set my network up the way i have.
I recently moved in with my girlfriend and brought my broadband package with me as i would have to pay a fee to cancel my contract within the contract period.
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Bearing in mind that it's just after Christmas and i can't afford to just run out and buy an ethernet modem or change my ISP - i thought that i would try something out.
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Then Airport received a firmware update and now it doesn't work and resetting the Airport doesn't help.
So now i have to get my hands dirty and like i say, i know jack about networks or the terminology.
With this configuration - and obviously we know that it can work (somehow!)
should i be in bridge mode or sharing a single IP address? and just how am i connecting to the internet. Static IP address/DHCP - PPPoE? I know what these abbreviations stand for but i don't know what they mean.
In the course of 'playing around' with the settings i have seen a message saying that Airport has an invalid I.P. address - why is it invalid and is that only because of something that i have changed or is that the route of the problem?
All the machines can see each other and the only clue i can provide is this log extract.
Jan 19 01:05:31 Severity:5 Initialized (firmware 7.2.1).
Jan 19 01:05:34 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
Jan 19 01:05:34 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:05:34 Severity:5 Rotated TKIP group key.
Jan 19 01:05:42 Severity:5 (WAN) link state is Up.
Jan 19 01:05:49 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:05:54 Severity:5 Associated with station 00:1d:4f:e3:87:17
Jan 19 01:05:54 Severity:5 Installed unicast CCMP key for supplicant 00:1d:4f:e3:87:17
Jan 19 01:06:04 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:06:19 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:06:19 Severity:5 Connection accepted from fe80::203:93ff:fe77:a4b0%vlan1/49186.
Jan 19 01:06:34 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:06:49 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:07:04 Severity:3 No Address for NTP server time.apple.com.
Jan 19 01:07:08 Severity:5 Connection accepted from fe80::203:93ff:fe77:a4b0%vlan1/49187.
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Jan 19 01:07:17 Severity:5 Deauthenticating with station
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I'm hoping that some networking guru is reading this and can provide me with a few pointers.
Can anyone help? I've been struggling with this for days now.
Thanks in advance.
Steve.

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Airport doesn't work after firmware update

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