Macbook wifi won't connect to internet

Cannot connect MBP to the 'net using wifi or ethernet. My iMac (on the same network) has no problem doing so (wifi).
"Network Preferences" shows green for ethernet connection. "Wi-Fi has the self-assigned IP address 169.254.22.253 and will not be able to connect to the internet"
[The Airport icon changes from connected and (! ) not connected. It doesn't seem to be limited to a wifi problem because an ethernet connection has the same inability to connect.]
Clues: Restarting computer, cable and wifi modems doesn't help. I have renewed DHCP lease without change to the problem (no Client ID required). There is no "Router Address" below the subnet mask (255.255.0.0) on the TCP/IP page. Configure IPv6: Automatically.
Creating a new network doesn't help.
IMPORTANT: My (Cisco) router shows a yellow light at the ethernet connection with the MBP but is otherwise operational with other devices.
This leads me to believe I have a hardware issue on MBP... very much appreciate your input; thanks.

Your time and date are likely not correct in System Preferences, so check that first that it's updated via Apple's time servers for your location.
I think you also need to head to System Preferences > Network and create a New Location (Unlock, then Edit Locations), then delete the old one, head to Airport > Avdanced > Ariport and delete all the wireless connections. Because fooing around you likely messed other things up.
Check this link out for more fixes.
..WiFi, Internet problems, possible solutions
Then simply start over new via the Airport connection in the top right corner and when it askes to save in KeyChain, do so.
I don't like Cisco/Linksys routers, they spy on your web traffic via their Cloud Connect.
http://tech.slashdot.org/story/12/06/29/1425210/cisco-pushing-cloud-connect-rout er-firmware-allows-web-history-tracking
Going to sell their home router division to Belkin I read.
For the best router IMHO, I advise the top end Netgear dual band, it's already plug and play with decent passwords provided, also you can increase the security and turn off PING.
Apple's routers require setup and you can't turn off PING so you can be Ping flooded by bothnets or it announces itself to hackers online, and if you don't set a awesome password, your fish food. Apple needs to improve their router software IMHO.
WiFi security issues, at home and WiFi hotspots
http://howsecureismypassword.net/

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