Can't get Mac to pull IP using dhcp both wired and wireless static works

I have a MAC that I can't get to pull and IP from my router using DHCP. I try both wired and wireless and it does not.  If I set the settings manually it works. I have also tried different routers and hotspots and it does not matter.
Any ideas,

Jeff
jeffreychorbaAsked:
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arrorynCommented:
Do you get any IP address at all, eg a 169.... APIPA address, or just nothing at all?
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jeffreychorbaAuthor Commented:
yes, I get a 169.x.x.x
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arrorynCommented:
Generally, with it working on other routers etc I'd say it's an authentication issue, but you've already ruled that out by connecting via ethernet.

What's the router model and firmware version? I've heard, for example, of iPhones on certain iOS versions that can't authenticate to the Netgear APs that have the firmware version 5.0.x - might be a known bug?

You've tested the device on other routers; have you tested other devices on this router?
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Craig BeckCommented:
I 'think' this is because you have a DHCP Client ID configured on the MAC.

Try removing it and see if that helps.

This might be of use...

https://discussions.apple.com/thread/2720975?start=0&tstart=0
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jeffreychorbaAuthor Commented:
I get an IP of 169.x.x.x regardless if I am hard wired or wireless. Others devices on the network from PCs to macs to I phones and droids not have any problems. I tried the Mac that is having trouble on different routers at other locations and I have the same problem?
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jeffreychorbaAuthor Commented:
Also, I do not have dhcp client Id configured
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Craig BeckCommented:
Like I said in my last post, see if the DHCP Client ID is configured on the MAC.

I had a school which was having issues with ~30 MACs.  The IT Admin there had set DHCP Client IDs on them and they wouldn't pull IP addresses.  We removed the ID and all was fine.
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Craig BeckCommented:
Ok I didn't see your last post while I was writing mine.
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Craig BeckCommented:
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strungCommented:
Pull down the GO Menu in Finder to Go to Folder and type in

/Library/Preferences/

Then delete the  file called "com.apple.alf.plist."

Then reboot the system and log in again.
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strungCommented:
Also make sure the Mac firewall is disabled.
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jeffreychorbaAuthor Commented:
Did the trick. Thanks alot
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