Oh IBM's first MCA PS/2 PC's had a wonderful issue in some models. They used a daughter card to present the expansion slots. Many had a habit of placing the m

Oh IBM's first MCA PS/2 PC's had a wonderful issue in some models. They used a daughter card to present the expansion slots. Many had a habit of placing the monitor upon the top of the case (as was norm back then) and a gentle tap would momentarily wiggle that daughter card due to the case bearing the monitors weight and cause the system to lock right up. Solution - don't put the monitor upon the PC case was not a happy solution for many, but was the solution.