no wireless hardware installed

For hardware related issues reset PRAM and SMC

Reset PRAM. http://support.apple.com/kb/PH4405

Reset SMC. http://support.apple.com/kb/HT3964

Choose the method for:

"Resetting SMC on portables with a battery you should not remove on your own".

If this does not help, contact Apple.

Best.

You may have to take the computer to the Apple store to have it checked out.

Best.