Mac Pro Cannot Connect to Netopia Cayman 3346 Router

I have 2 Macs and 2 Windows Machine at home all connected via an ethernet usb hub to a Cayman 3346 Netopia router. None of the Macs or PCs have any trouble connecting to the internet. However, I just got a new Mac Pro and anytime I start up the machine with ethernet plugged in it just hangs. If I start up without ethernet plugged in it starts up fine (it is connecting via DHCP though I have tried it with a fixed IP address, as well - same results). If I then plug in ethernet after the startup, I am able to connect briefly to the internet but then any network action causes the Mac to hang. I'm using 10.4.8. Does anyone else have this happening or any ideas on how to fix this. I have taken the Mac Pro to my office and connected via ethernet with no issues so it does appear it has soemthign to do with my router and the Mac Pro specifically. Grateful for any help.

Is your system looking for a server on startup?
Do you have IPv6 off/manual/automatic? I'd turn it off.
There use to be a problem with not having the primary and secondary domain name servers (which your router picks up) needing to be manually entered in the Network control panel.
Apple Guide to Troubleshooting Network
http://docs.info.apple.com/article.html?artnum=106749
See if anything in that helps.

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Mac Pro cannot connect to WiFi... connection timeout error

I have an early 2008 Mac Pro desktop running 10.7.2. I have it connected to the Internet via copper, but it is also part of my internal wireless network. I am consistently getting "could not join [network]. A connection timeout occurred. This is a recent issue, and I've made no system changes that I can remember that would have caused this.
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Hi! Please help me. We have an internet WIFI connection in our office but only my MacBook Pro cannot connect even when I entered the correct password. My Iphone and Ipad work just fine. It says "connection timeout" but all other laptops can connect. I tried network diagnostics already and it always say "connection timeout". I dont know what to do anymore.

Yes, and when I open the Network Utility it shows a working IP address, and a 54Mb/s speed from the wireless router. It even shows the shared computers from my roomates. But when I try to access the internet it does not load anything on Safari or Firefox ( or any other internet application for that matter). It is completely unconnected. YET, As soon as I activate the AirPort card on the top right where I have my signal strength, it shows on the Network Utility information that there are 'packages' being sent and received, and I have NO programs open what so ever, I have closed everything except finder and network utility... Does this mean I am being hacked, or have some sort of Trojan or something in my computer? I ran an antivirus that my school provided, called Virex by McAfee, it came out clean except it says it cannot read one file.
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Direct you to the proper forum for MacBook :
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Mac OS X Forums
https://discussions.apple.com/community/mac_os?view=discussions
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My MacBook Pro cannot connect to WiFi

Hi guys.
I have a MacBook Pro 15" which I got about two years ago. I'm using OS Lion 10.7. I didn't had any problems for two years but about a month ago our wifi had a little damage. So we bought another one, the same model. First none of the devices were connected but then our iPads and iPhones did. Then my sisters macbook pro which is the same of mine, got connected. But everytime I try to connect it says "Alert: no internet connection". My Macbook can find the wifi, but it cant connect it. When I open network preferences, It says "Wifi does not have an IP address and cannot connect to the Internet." But my sisters macbook with all same settings with mine can find the IP address! I really need help, Im a student and my homeworks are on websites so I should connect to internet. Hoping for answers .
P.S ( English is not my native language, so sorry for mistakes )
Ozan.

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Mac Pro Cannot Connect to Netopia Cayman 3346 Router

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