"Can't open Asus AIO for change HDD"に関する回答migueltroncoso is right. The ASUS ET2230I AIO does not have the four screw covers in the four corners on the back. There are NO covers of any sort, just smooth plastic! The only screws to find are in the optical drive bay and 2 of them can only be accessed by taking the door(front piece) off of the drive and pushing the drive back in. The edge of the back cover is close to the front glass and there is only one small "slot" on the bottom edge to put a spudger into. HELP!