2004 Volvo C70 key won't turn

Do you have more then one key? If you do have another key, if you use that key as well do you have the same problem? If you do the most likely problem is the steering column lock is bad. Remove the steering column covers and on the right side of column is the switch. Remove the 2 screws and pull switch out and see if the key will turn. If it doesn't replace the column lock. If it does turn replace the switch.