Good Signal, but not Internet with built-in Airport card

Hi,
I'm sorry if this is a duplicate question, but I couldn't seem to find a similar situation. I'm trying to get my wireless (or any) Internet working at my house with my Powerbook G4 with a built-in Airport card. We have a Linksys 802.11g router with no security enabled. My mac is picking up a very strong signal, but everytime I go to Safari, iTunes, or Explorer it says there's no internet connection present (yet internet connect and my network says I'm connected through Airport).
I've had my wireless and ethernet working on this computer before -- picking up a variety of signals, including other linksys routers. All of the PCs in the house are working fine with this, and my mac even shows up on our router list.
The most recent experience I had with internet on my mac was earlier this week--i took it into my work to do some testing and we had to set up a specific location to get it to work through that ethernet network. When I took it home, I removed all of those configurations and tried both my wireless and ethernet, and I can not get either working. At this point, I've removed all of my configurations and tried reconfiguring. Everything but my airport is turned off. No proxies are selected. I've turned off the iPv6. I'm using DHCP (which is showing the correct router and IP address). I've deleted the System Configuration folder from Preferences. And it's on the top of the list in network and have selected Airport as the default. And none of this seems to be working. Oh, and I tested to see if it was a DNS problem (which I head read in one discussion forum), and that didn't fix it. I'm sure it's something simple that I'm missing. But I can't for the life of me get it to work.
Does anyone have any thoughts? suggestions? insights? help?
Please? I'm pulling my hair out trying to figure out what this could be.
Thanks so much in advance.
meg.

Joel,
I am having the same exact problem and have had it for months now.
Here is my tcpdump, hope you can help.
Last login: Sat Sep 2 11:46:05 on ttyp1
Welcome to Darwin!
Orion:~ tarlach$ sudo tcpdump -nni en1
Password:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on en1, link-type EN10MB (Ethernet), capture size 96 bytes
12:54:33.236551 IP 169.254.196.234 > 224.0.0.251: igmp v2 report 224.0.0.251
12:54:33.635688 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0 [5q][|domain]
12:54:33.635896 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0 [5q][|domain]
12:54:34.647999 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0*- [0q] 9/0/0[|domain]
12:54:34.648258 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0*- [0q] 9/0/0[|domain]
12:54:35.436941 fe80::20d:93ff:fe84:ba8c > ff02::fb: HBH icmp6: multicast listener report max resp delay: 0 addr: ff02::fb [hlim 1]
12:54:35.648474 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:54:35.954863 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:54:41.635570 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0 [5q][|domain]
12:54:41.635820 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0 [5q][|domain]
12:54:42.647940 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0*- [0q] 9/0/0[|domain]
12:54:42.648177 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0*- [0q] 9/0/0[|domain]
12:54:43.804966 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 112
12:54:44.472343 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:54:44.534688 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:54:52.940381 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:54:53.020918 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 83
12:54:53.457391 arp who-has 192.168.2.1 tell 0.0.0.0
12:54:53.457981 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:54:53.458573 arp reply 192.168.2.1 is-at 00:11:50:4f:4a:40
12:54:55.785686 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 76
12:54:57.635663 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0 [5q][|domain]
12:54:57.635911 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0 [5q][|domain]
12:54:58.646996 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0*- [0q] 9/0/0[|domain]
12:54:58.647240 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0*- [0q] 9/0/0[|domain]
12:55:01.016643 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:55:02.149064 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:55:09.439854 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:55:10.767834 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:55:15.139955 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 112
12:55:17.499395 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:55:19.379023 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0d:93:84:ba:8c, length: 300
12:55:25.597876 fe80::20d:93ff:fe84:ba8c > ff02::2: icmp6: router solicitation
12:55:27.120694 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 76
12:55:29.634050 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0 [5q][|domain]
12:55:29.634282 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0 [5q][|domain]
12:55:30.646358 IP 169.254.196.234.5353 > 224.0.0.251.5353: 0*- [0q] 9/0/0[|domain]
12:55:30.646601 fe80::20d:93ff:fe84:ba8c.5353 > ff02::fb.5353: 0*- [0q] 9/0/0[|domain]
12:55:34.186230 IP 192.168.2.2.5353 > 224.0.0.251.5353: 0 [2q] PTR? daap.tcp.local. PTR? raop.tcp.local. (46)
12:55:55.076547 IP 192.168.2.4.631 > 192.168.2.255.631: UDP, length: 83
I cut it off as it seemed to want to just keep running.
I am unable to get online in my own wep network, I can connect and get a strong signal b ut that is all.
Please, if you can, help.
thank yhou

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