Wi-Fi (no hardware installed)

Had this today when I booted up on my iMac, tried turning it on incase that worked but it never so I tried re-starting which did the trick.

Any ideas what may have caused it and is it common?

Sam Problem .Pls help me Anyone?

according to the discussion below:
https://discussions.apple.com/thread/3210949?start=0&tstart=0

this is a common problem. one of the 'fixes' as described is to not turn on the keyboard and trackpad until the grey login screen appears.

see if this helps. it doesn't say why it happens though.

J

Yep. j0nb0y32 is correct. It happens to me all the time when I forget and turn on the keyboard and mouse during boot. What happens is the BT radio is locking on to the KB and mouse at the same time the airport card is locking on to the wireless signal. I guess it's too much for the poor brain of the machine.

I did not use any keyboard or mouse .Then how its happen?
I update my Lion 10.7.1 to 10.7.2 .It still same problem.Pls help me.what do now ?

Do you have a wireless keyboard and mouse (blue tooth)?

Nope..i google it but no solution.Finally i will go to format my lion OS X. I hope its work .Thank for all ur Reply.