answer:Hi, @littlemisspro, welcome to Fluther! Probably the key will have no effect on running the computer. Or it is an on/off switch. Most likely it’s a lock to prevent tampering with the insides. In a corporate setting, you would want to prevent people from taking memory home or making any changes which might cause headaches for the IT department. Or, it may be an off/on switch, so you can prevent people from running the PC without the key. But I think that is less common.