AIR-3502 show a white LED and no console output.

like the title, i have upgrade the wlc version to 7.4.121.0,but the question didnot resolve.

Must be an old batch of AP.  
This is a known defect.  Some of us call it the "white LED of death".  You may need to RMA the AP.

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    Thank you very much for the response Jason and I am sorry for the late reply but as usual life got in the way.
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    alias su='su -l ' # invokes a login shell then changes to root's home directory
    As always thank you for the help, 

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