I have a Lian-Li PC-61 case. I'm having problems with the interior 80mm fan on the top blow-hole. I need to replace it.
Anyone with this type of case may know this issue. Lian-li make's great cases. There are no screws on the exterior or interior to remove the fan. What should be screws are smooth plastic, I beleive.
I suspect if you pry at the plastic cover to the screws you'll expose the screw head. However, before I go scratching up the interior and/or exterior of my case I'd like to know if anyone else has experience with this issue.