Can't connect to internet, always get (169.254) ip address

Mac Mini with OS X 10.5.8
Internet connection worked for years up til now.
I know the Comcast modem is working because my other computer accesses service fine.
I only connect directly from the Comcast modem to a single computer at any one time (to prevent conflicts).
I have disconnected the battery from the Comcast modem and rebooted the modem and my computer.
I have called Comcast and had them troubleshoot the line and reset the modem. All looks fine from their end.
I have trashed all plist files that have to do with the network (and let the computer regenerate new ones). I then reconfigured the network and the settings in Network seem exactly the same.
Any ideas? Could a bad internal battery be enough to cause this? Should I zap PRAM? Any suggestions will be entertained. Thanks, Peter
(Also, in Proxies dialog, I tried removing the info (*,local, 169.254/16) in the "Bypass Proxy Settings for These Hosts and Domains" and it would cause the "Configure Proxies" selection to default to "Always Use PAC File". Had to go back and retrash all the plist files to have Proxies go back to "Configure Proxies-Manually".
Here are my settings:

In my G5 (OS X 4.11) the Network area for Proxies has "Configure Proxies" set to "Manually", same as Mac Mini (OS X 5.8); that's why I can't understand the ability of one to work and not the other. (I'm fairly clueless about all the jargon in the Network configuring process, so asking me about proxies, etc will garner few informed response.)
Yes, I did use the "Insert Image" command. Don't know why it would be messed up. I will try again here.
And I'll try powering down the Modem for a longer period. Thanks.

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My system is constantly getting bad IP addresses from wireless base stations. Problem started while I'm traveling. At last location, of my three computers my PC would connect, but the two Macs kept having problems. Both worked at first, but then one or the other would get 169. IP addresses. One would seldom connect after restarting. The other would eventually get a good address.
I'm now at location number two. My Mac connected once, but now keeps getting bad IP addresses. Two PCs are working here, and so is another Mac. Restarting, running diagnostics, resetting the modem, and trying to renew the DHCP lease are all not working. Very frustrating.
I launched iChat on both Macs but mine can't see the other Mac. My Mac says I'm connected to the network, but can't surf the internet. Tried to manually enter IP numbers but that didn't work either.

For clarity, the 169. addy is not bad, it's self assigned, as is usual when it can't find any being handed out.
Try making a New Location as a test.
Try making a New User as a test.

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You want the device that is directly connected to the modem to furnish the PPPoE service.
This is sounding like you had your Mac connected directly to your modem at one time, so in that type of setup, the PPPoE connection on the Mac would have been correct.
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Either delete the PPPoE connection on your Mac, or if you want to retain it in case you need to connect your Mac directly to the modem at some point in the future, make that connection inactive.
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My router used to work. I updated the firmware to 4.21. xx and after that I can't connect to internet.
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Sherya, welcome to the forum.
When requesting help, you should always include the make/model of the computer and/or monitor. This information is necessary for us to review the specifications of them.
I believe that this is a problem for your ISP. Their Customer Service should be able to help you. There may be some settings that can be changed to solve the problem. They would know what the settings should be. I don't believe that it is a hardware problem.
Please click "Accept as Solution" if your problem is solved.
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Can't connect to internet, always get (169.254) ip address

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