iMac FP with 10.4.11 can't connect to internet but system preferences says it is connected (as are all other computers on the LAN)

You symptoms indicate that your DNS server isn't working. Although since you other comptuers are working, this doesn't really fit either.

You can use

harddrive > applications > utilities > network utility

to diagnose the situation.

You can ping <b>google.com</b>. Result:

Ping has started ...

PING google.com (64.233.167.99): 56 data bytes

64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=215.362 ms

64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=279.597 ms

64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=189.747 ms

64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=250.657 ms

64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=183.232 ms

64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=243.753 ms

64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=173.108 ms

64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=230.239 ms

64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=180.639 ms

64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=232.177 ms

--- google.com ping statistics ---

10 packets transmitted, 10 packets received, 0% packet loss

round-trip min/avg/max/stddev = 173.108/217.851/279.597/33.615 ms

If that does work, try pinging <b>64.233.167.99</b> Result:

Ping has started ...

PING 64.233.167.99 (64.233.167.99): 56 data bytes

64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=189.655 ms

64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=213.471 ms

64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=257.873 ms

64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=172.745 ms

64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=226.723 ms

64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=171.883 ms

64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=260.308 ms

64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=172.963 ms

64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=198.840 ms

64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=181.215 ms

--- 64.233.167.99 ping statistics ---

10 packets transmitted, 10 packets received, 0% packet loss

round-trip min/avg/max/stddev = 171.883/204.568/260.308/32.247 ms

If pinging 17.254.3.183 works but pinging Google.com doesn't. You have a bad DNS Server address.

BDAqua suggests in a post.

You can use OpenDNS for looking up web addresses.

Put these numbers in Network>TCP/IP>DNS Servers for a try...

208.67.222.222

208.67.220.220

I think they now pretend you need to join to use, but you don't.

https://www.opendns.com/homenetwork/start/device/apple-osx-tiger

(Please note that you do not need to a joint Open DNS to use it.)

http://discussions.apple.com/message.jspa?messageID=5908432#5908432

Google provides free dns lookup too. There numbers are:

8.8.8.8

8.8.4.4

Robert

Glad to hear & thanks.

Robert