How far of are the holes?
You need to check that the flappy bits on the I/O shield plate are not in the way of the ports, some of the flappy bits sit on top of the silver boxes that contain the ports.
Apply a little pressure to the edge of the board closest to the drives, to get the holes to line up, then get a screw in with the other hand.
Noob question,
You have got the IO shield plate the right way around etc?
Glad you got it sorted.![]()