I just started my first build with an Antec 900 case. I removed the upper 3.5 inch drive bay since I am only installing two drives. But I can't get the fan off. I removed the drive bay from the case, but I can't remove the plastic fan mount from the drive bay because it has these plastic chips and I can't get it off. I can't remove the fan from the mount because the screws are not acsesable. How can I remove these fans?