LAN internet connection just stopped working

Hi all,
I've just signed up to use my university LAN for accessing the internet yesterday. I registered my MAC address, and all was working fine: I could check my e-mail, use Safari etc. Then suddenly yesterday afternoon my connection stopped working, and my iBook began behaving weirdly: when it's connected to the LAN, it will assign itself an IP address and show a green light for "Built-in Ethernet" under Network Preferences, but it won't load any webpages, get my e-mail in Mail, or access any databases in Endnote.
Moreover, when I restart my computer with the network cable plugged in, when I log-in the dock appears successfully, as do the volume, time and battery indicator, but the grey menu-bar that normally lies underneath the time/battery indicator etc. at the top of the screen won't appear, and the cursor turns to a permanent spinning wheel. As soon as I remove the network cable, the grey bar reappears and log-in continues as normal.
Finally, Help Viewer crashes if I try and load it when I've got the netork cable plugged in, but works fine if I've got it removed.
Any idea what's happening?
Cheers,
Laurence
FYI: I also have Virex 7.2 on my comuter, but have set it up so that it doesn't load at start-up, if that's got any relevance... Tha LAN itself is working fine, I'm writing this on a Windows machine which is also connected to the LAN... The LAN uses DHCP automatic assignment of IP addresses.

Laurence,
You had posted a question about the LOCATION not being displayed in the iPod Calendar. That post has been archived so I cannot post a reply to it. Since I don't know your email address I'm going to respond to that here. Hopefully the topic-police will be understanding.
The problem is that the iPod calendar software ignores some of the tags in the ics file including LOCATION, ATTENDEE, and PRIORITY. I've written a Perl script which corrects the problem for an ics file generated with iCal, but I haven't tested it with an Outlook generated ics file yet. Also, my solution isn't perfect because every time you resync you have to fix the files again, so until Apple corrects this your best bet may be to regularly put the location information in your description field. I'll be posting my solution at <http://isd.usc.edu/~bbellina> sometime in the next couple of days.
Regards,
Brendan Bellina

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