Ethernet connection to Internet not working

I have a mac mini (pre wireless) connected to a siemens gigaset se587 wlan DSL router via Ethernet cable. This worked fine when I set it up a couple of weeks ago. Now the mac mini has stopped connecting to the Internet. The router is working: I can still connect to Internet wirelessly on my iPhone and can still run airtunes on an Airport express from the iPhone remote app.
My ISP (tiscali) don't support mac and have been useless. Apple support also can't work it out.
I've reset countless times and tried setting up a new connection and the mac can recognize the router it just won't open any web pages!
Please help - I'm tearing my hair out!

This could be a DNS server issue.
Following the suggestion in this post (thanks AndyO!) to enter an IP number directly would give us more info:
http://discussions.apple.com/thread.jspa?messageID=6151522&#6151522
If it is a DNS server issue, then switching to DNS server like OpenDNS might help resolve it:
https://www.opendns.com/start
though there are some countries where OpenDNS is not available.

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