I have a problem with TiBook 667MHz - built-in DVD/CDRW seems to be ok (it is seen by the system), but I cannot put any disc in it. I can put adisk inside to the moment when a hole touches an edge of the computer. Then I feel resistance - I cannot push even a milimeter more (in fact I did not try too much because I was afraid that I can destroy something). I wonder if this is hardware or software issue.