Why will On board diagnostic computing give ant readings? on 2005 Volvo S80

When car was undergoing state inspection of board computer would not give any reading to state diagnostic computer

Asked by for the 2005 Volvo S80
ck cig lighter fuse and all ohters while your there
Well thank you all for the advise as a note to those who may have the problem of going for a state inspection and their computer does not get anything from your Volvo's computer the very first you should check is make certain the service light is reset, once that is done all your problems with the obc are resolved.
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There may be a blown fuse. Check all fuses.
First thing checked, also shops computer is working ok and cable is goog