I have 2 pcs, one I just bought and one from Feburary that I use for spare room and parents.
I just took out motherboard from one as wanted to test another board from a new pc I built as it wasnt powering on and cleaned the case at same time.
Anyway the drives arent held in by screws but 2 clips that twist round but unfortunatly the clip has snapped off and left the metal bit on the drive meaning I cant remove it and I cant unscrew the part where the drive goes as the screws are moulded on.
On my newly purchased machine having a similar issue though it has 1 large twistable clip but I have twisted it up and yet drive wont budge.
I will get more info like case type and pics if needed.