IMac connected via ethernet, but no internet

I'm running Snow Leopard on an iMac (model identifier iMac 4,1)
Two days ago it was working fine. Then yesterday, suddenly the internet wasn't working.
I run an ethernet cable onto a switch and from there connect various devices that are not usually on simultaneously. I have tried the cable going to the iMac on my laptop and the internet works. I also tried the cable that I'm currently using on my laptop on the iMac and that didn't work either.
Yesterday, I restarted it several times, tried resetting the PRAM, fixing permissions.... Eventually a 6th or so restart did the trick, but then when I turned it on today it went back to not working.
When I open the Network option from the System Preferences pane, it says the Ethernet is connected. Also, IPv4 is using DHCP and the DNS server is the same as the router number. No idea what that means, but if it helps...
It does say "Ethernet is currently active and has the IP address xxxxxxxxxxxx2.10" whereas the router number is xxxxxxxxxxxx2.1 Don't know if that has anything to do with it.
Anyone have any ideas?

Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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Apple Tv (3rd generation) says it is connected (via ethernet), but none of the app, or channels, will work. They all say they are unvailable, try again later. The only thing that seems to work is iTunes. (I live in a dorm if that helps)

Apple Tv (3rd generation) says it is connected (via ethernet), but none of the app, or channels, will work. They all say they are unvailable, try again later. The only thing that seems to work is iTunes. (I live in a dorm if that helps)

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Powerbook G4 can't connect via ethernet but connects via airport

We have a small office network connected to an Efficient Networks DSL router that's managed by our isp. The router has 4 ports and a linksys 8 port switch is connected to one of those ports. Another D-Link wireless router/switch is connected to another port.
2 i-macs connect without problem via ethernet cable. They are set to DHCP and get 192.xx private addresses. Both run 10.4.5. Another older imac running 9.2.2. also has no problems.
I recently purchased a powerbook G4 and it will not connect via ethernet to the Efficient networks router. At first it was connected to the linksys, so decided to connect it direct to the Efficient Networks router. With DHCP, it acquires a 169. internet address which is self generated (i.e. no real connection). I tried to give it a static private address (talking to the isp provider). They could see the powerbook but saw all zero's (presumable mac address). By the way the Powerbook works perfectly at home connected via ethernet cable to a D-Link router connected to a cable modem so it's not a physical problem. I even checked the ethernet cable I used in the office with another computer - no problem.
When I switch to airport in the office, the powerbook connects to the network and the internet. I get some strange warning messages showing the server's and the router's private ip addresses. I click ok, and the powerbook finds an unassigned private ip address. It's the only way it will work, but it causes problems, because I can't connect to one of the network printers. Speed also isn't great.
Can anyone give me advise how to proceed. I am no expert on this stuff so keep it as simple as possible.
Tks

Tim,
Thanks for your help. Here's what I've done before reading your e-mail. The D-Link DI-524 wireless router is connected to the Effiicent Neworks DSL router as you mentioned. One ethernet port of the EFF.Net. router is connected to the WAN port of the DI-514.
Because I have a D-Link router at home which works flawlessly with my powerbook, I decided to connect the ethernet cable of the powerbook to the D-Link which has 4 ethernet ports. Lo and behold, the powerbook acquired a private ip address and connected to the LAN and internet!
When I connected the powerbook direct to the Efficient Networks router, it could not communicate. I believe that there must be some software incompatibility between the powerbook and the Efficient Networks router. By connecting to the D-Link, the D-Link assigned an ip address to the powerbook, and it could connect to the server, lan, etc..
Only problem is that I have a Brother network printer that cannot connect to the powerbook. My powerbook cannot find it on the network. Because there is a linksys switch connected to the efficient networks router's third ethernet port, maybe as you said, going through the D-Link via DHCP (when the Linksys is also acting as a DHCP server, might cause this type of problem. What do you think?
As a final note, other imac G5's connected to the linksys switch (which then connects to the Efficient Network's router) have no problem connecting to the lan or internet and have no problem connecting to any of the printers. When I put the powerbook on that switch, I could not connect to the internet - i.e. whether connecting via the lynksys switch or direct with the efficient networks router - same results: no internet connection whether manually or via DHCP.
So the imac G5 has no problem with the efficient networks router but the powerbook G4 hits a brick wall. The G4 likes the D-Link router. I am concerned (and I will have to check this) that if I turn off the dhcp server feature from the D-Link, that whatever software issue crops up between the powerbook and the Efficient Networks router, will rise up again, because the D-Link will act like a simple switch (just like my linksys switch), and we'll be back to square zero. In any case, no harm in trying. This may be the cause of the Powerbook not seeing that Brother printer (even though it sees another printer and other macs).
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Chris Johnson2 wrote:
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Welcome to the Apple Discussions!
More information would be helpful. Your iMac is connected to your ISP's service with Ethernet? And you are sharing that internet connection for the iMac with other Apple devices from the iMac's AirPort card? Do I have that correct?
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7. Encrypt the network with one of the choices
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Dah•veed

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I suddenly lost the connection to the internet on my G3 333 MHz imac.
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Hi,
You also might want to check that the AirPort doesnt have it selected to have the IP set manually. Always have this detected by DHCP. There should'nt be any problems there, if you are using the Ethernet cable.
Regards
Marc

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IMac connected via ethernet, but no internet

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