DHCP not working with MacBook Pro

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hi -

1 of our users on large college network has 2008 macbook pro running lion. other day laptop froze, , ever since has not been able pick ip addresses via dhcp, assign 169.254 range address. problem exists on both ethernet & wi-fi. have tried following without success;

removed proxy entries/pasv mode
new location
different user account
trashed 'systemconfiguration' folder
removed college entries keychain
installed usb ethernet adapter
reset pram

ethernet cable , wallport connected work fine other pcs.
running out of ideas - suggestions please?

thanks.
 

hi,

have tried must done in such case.

might add : use disk utility "check disk" , "repair permissions".

if no success, reinstall system (without wiping disk).
cmd + r on boot (os x recovery).
 


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