Mini Mac suddenly won't connect to the net.

Hello,
Didn't realise you guys existed until I was pointed in you direction so I'm hoping you might be able to help.
I started this thread http://forums.seloc.org/viewthread.php?tid=71654 on another forum I use. It has all the details of my problem. If there is anything I should be doing it would be great If you could point me in the right direction.
Thanks in advance
Karl

Sorry for that, I've cut and pasted the different parts that I wrote.....
I've been running a mini mac for nearly a year now and all's been well up until last friday. I use Tiscali's cheapo broadband package and that has been problem free until the mac suddenly decided that it can't connect last Friday.
It's set up so that it automatically tells you when the adsl modem is connected. You can then check the modem and it is running fine. If I then try and open an internet page it's saying that the internet isn't conected. If I open internet connect and click for it to connect then it just say that it is idle and won't do anything different. When you look at the connection log it says that a pipe is broken?? and that's why it won't connect.
If I look at the system information then it says that ethernet (en1) is enabeld but the cable isn't connected. Tried everything I can think of but it hasn't helped. Contacted apple but they want £35 to try and talk me through the problem. Tried Tiscali but all there suggestions have made no difference.
I'm now using a six year old PC that's taken the best part of a week to get me online, I'm guessing the connection is OK as it's working on this PC but why isn't it working on the mac? Any advice will be genuinely appreciated
Tried unplugging/ re attaching all the cables but it made no difference. I'm using the same modem and cables at the moment with this dodgy old PC so I'm guessing there isn't anything wrong with them.
I do the repair permissions thing so but hasn't seemed to help.
It's a Mini Mac running OS 10.3.9 ( I think ) I use Tiscali via a phone filter and then into a sagem modem (whatever they give you). The modem is connected to the mac via a usb cable.
I've tried a different cable, and the modem is working Ok with this PC. So It's not Tiscali's end.
I've jut spent the last hour messing around with the mac but it's making no difference. The Mac knows that the USB modem is connected but it won't connect to the net. I just tried to use tiscali's DNS number but I can't seem to sort it, I even tried pinging that number but nothing is coming back. It was set up to use ethernet adaptor (en1) and then you just clicked on a little icon in the top bar and it would connect to the net.
Is there any way to wipe all the settings and try to get it going from scratch. Would it work if I bought a router and plugged it straight into the mac without a modem? There is a firewire connection on the back.
If I look back it says something about a broken pipe. On the network set up screen it says that the cable isn't connected to (en1), so I'm guessing that may be why it not getting in contact with the net?
I've now had suggestions to ditch the modem and buy a router?? Is there anything I should looking for in particular?
Thanks again.

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