Not releasing IP address

I've been having problems with my broadband connection for a few days and according to my ISP there is nothing wrong with the line or modem. They've told me that the cause of the problem is that my computers aren't releasing the IP addesses. Even when you try to force them to renew the DHCP lease nothing happens. This is happening on a PowerBook, iBook and a Win XP laptop. They are all showing the same IP address. I've tried reseting the AEBS etc and this worked once at the weekend but not since. My ISP has said that my computers all need to go for 'repair' to sort the problem which I'm not convinced is right. Is it not the airport that issues the new IP address rather than the computer releasing it?
I'm using a 6 month old extreme with a cable modem broadband setup.
I've also dug out my old slightly dodgy (signal drops a lot) graphite airport to try today but although I managed to get it giving strong signal, same IP address as other one and no internet connection when open browser, exactly the same as happens with extreme.
By the way, nothing else has changed, the network settings are correct and has been working perfectly up to now.
Any one know whats wrong or what I can do about it?
Please help!
Clare.
PowerBook, iBook, iMac Mac OS X (10.3.9) Airport Extreme

Woo Hoo!
As of this morning I'm back on broadband! Despite doing nothing at this end which completely validates the techs at Telewest being usless. The fact that two of them kept putting me on hold every 30 secs when I didn't give them answers they wanted as they went and looked up their manual was also a clue...
I connected the modem directly to PB and iBook at the weekend but it didn't work which made me more convinced it was at fault with ISP, but they thought otherwise as apparently my modem was responding to them when the tested from their end.
As my broadband has been working perfectly for the past 5 years I've never had much reason to be concerned with network settiings and how IP addesses work but over the pat few days I've had a bit of a crash course! I was begining to work it out in my head through trial and error so thanks for explaining it.
It looks like it was indeed a problem on the line. Hopefully thats the last of it. What was annoying me was that last monday broadand went down as well and when called ISP without them asking a lot of questions they told me somebody had already reported a fault and it would be fixed in a few hours which it was. However when it went again on saturday, they of course asked what OS I was on and the mention of apple resulted in ten million question and the fact that I'd repeatedly checked everything at this end before I'd called stumped them. They insisted that it wasn't right that the IP was the same therefore it must be my mac and it needed to be sent away, all 3 of them that is, and the Win laptop too for good measure!!
I now have dial up installed so never again will I have to take their word for it.
Thanks for yourr help
Clare.
iBook, PowerBook, iMac Mac OS X (10.2.x)
iBook 800MHz Mac OS X (10.2.x)

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jasonwryan wrote:How do you start X?
startx
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Xorg.log.0.old
[ 5770.071] (II) RADEON(0): Modeline "1680x1050"x0.0 119.00 1680 1728 1760 1840 1050 1053 1059 1080 +hsync -vsync (64.7 kHz e)
[ 5770.071] (II) RADEON(0): Modeline "1920x1080"x60.0 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[ 5770.110] (II) systemd-logind: got resume for 13:68
[ 5770.110] (II) systemd-logind: got resume for 13:67
[ 5770.126] (II) systemd-logind: got resume for 13:64
[ 5770.156] (II) systemd-logind: got resume for 13:65
[ 5770.209] (II) systemd-logind: got resume for 13:66
[ 5885.135] (II) systemd-logind: got pause for 226:0
[ 5885.135] (II) systemd-logind: got pause for 13:68
[ 5885.135] (II) systemd-logind: got pause for 13:67
[ 5885.135] (II) systemd-logind: got pause for 13:64
[ 5885.135] (II) systemd-logind: got pause for 13:65
[ 5885.135] (II) systemd-logind: got pause for 13:66
[ 5893.481] (II) evdev: USB Keyboard: Close
[ 5893.481] (II) UnloadModule: "evdev"
[ 5893.481] (II) systemd-logind: releasing fd for 13:66
[ 5893.481] (EE) systemd-logind: failed to release device: Connection is closed
[ 5893.481] (II) evdev: USB Keyboard: Close
[ 5893.481] (II) UnloadModule: "evdev"
[ 5893.481] (II) systemd-logind: releasing fd for 13:65
[ 5893.481] (EE) systemd-logind: failed to release device: Connection is closed
[ 5893.481] (II) evdev: A4Tech PS/2+USB Mouse: Close
[ 5893.481] (II) UnloadModule: "evdev"
[ 5893.481] (II) systemd-logind: releasing fd for 13:64
[ 5893.481] (EE) systemd-logind: failed to release device: Connection is closed
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[ 5893.481] (II) UnloadModule: "evdev"
[ 5893.481] (II) systemd-logind: releasing fd for 13:67
[ 5893.481] (EE) systemd-logind: failed to release device: Connection is closed
[ 5893.481] (II) evdev: Power Button: Close
[ 5893.481] (II) UnloadModule: "evdev"
[ 5893.481] (II) systemd-logind: releasing fd for 13:68
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[ 5893.560] (WW) xf86CloseConsole: VT_GETMODE failed: Input/output error
[ 5893.560] (EE)
Fatal server error:
[ 5893.560] (EE) xf86CloseConsole: VT_ACTIVATE failed: Input/output error
[ 5893.560] (EE)
[ 5893.560] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
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[ 5893.560] (EE) Please also check the log file at "/home/n0rv/.local/share/xorg/Xorg.0.log" for additional information.
[ 5893.560] (EE)
[ 5893.560] (EE)
[ 5893.560] (EE) Backtrace:
[ 5893.613] (EE) 0: /usr/bin/Xorg.bin (xorg_backtrace+0x56) [0x593966]
[ 5893.614] (EE) 1: /usr/bin/Xorg.bin (0x400000+0x197b69) [0x597b69]
[ 5893.614] (EE) 2: /usr/lib/libc.so.6 (0x7f5912809000+0x33df0) [0x7f591283cdf0]
[ 5893.614] (EE)
[ 5893.614] (EE) Segmentation fault at address 0x0
[ 5893.614] (EE)
FatalError re-entered, aborting
[ 5893.614] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 5893.614] (EE)
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sie 07 23:15:12 Arch systemd[3372]: Starting Default.
sie 07 23:15:12 Arch systemd[3372]: Reached target Default.
sie 07 23:15:12 Arch systemd[3372]: Startup finished in 7ms.
sie 07 23:15:12 Arch systemd[1]: Started User Manager for UID 0.
sie 07 23:15:20 Arch kernel: SysRq : Keyboard mode set to system default
sie 07 23:15:20 Arch systemd-journal[1227]: Journal stopped
sie 07 23:15:21 Arch systemd-journal[3399]: Permanent journal is using 131.6M (max allowed 100.0M, trying to leave 2.9G free of 6.0G available → current limit 131.6M).
sie 07 23:15:21 Arch kernel: SysRq : Terminate All Tasks
sie 07 23:15:21 Arch systemd-journald[1227]: Received SIGTERM.
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