This may be a dumb question, but I am building my first PC and one of the standoffs won't screw into place. It's at point A, so it's in the corner closest to the back of the PC near the mouse and keyboard port. Is it alright if that one standoff doesn't go in or do I need to try to figure something out? I think the standoff hole was frayed or stripped or something. I tried and tried and the standoff wouldn't even screw in partially. It's a full ATX, if that matters. Thanks!!