Mac Mini has intermittent network access - other computers on network ok

My inlaws just got a new Mac Mini and it is having networking problems. The network is currently setup with a cable modem which feeds a router that hosts several other computers, both Apple and PC. All of the computers are using DHCP for IP assignment. None of the other computers are having any problems. The Mini seems to get assigned an address correctly, even according to the computer's own network diagnostics, but internet access is spotty. Some webpages load instantly, some take up to 20s, and sometimes they don't load at all. I also tried manual IP assignment, but there doesn't seem to be any effect on the performance. Any ideas?

Hi Whiteknight & Welcome to the forums,
The network is currently setup with a cable modem which feeds a router that hosts several other computers, both Apple and PC. All of the computers are using DHCP for IP assignment.
Make/model of your router?
How is your MacMini connected to the router (wired/wireless(ly)?)
None of the other computers are having any problems. The Mini seems to get assigned an address correctly, even according to the computer's own network diagnostics, but internet access is spotty. Some webpages load instantly, some take up to 20s, and sometimes they don't load at all.
It's a VFAQ already
Take a look @ this thread and take a screenshot of your TCP/IP settings too (this would help us spot incorrect settings (if any))
can you ping other computers on your network?
I also tried manual IP assignment, but there doesn't seem to be any effect on the performance. Any ideas?
That's unlikely. Verify that the Mini get its TCP/IP settigns manually (and correctly) and that you can ping the rest of the computers and your router successfully. Post back info to see how it's going.
Macs running 9.x, Macs running 10.4.x and SGI workstations running Irix 6.5.x

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