I was chatting with some low-tech friends, people who use their computers for day to day desktop tasks, about terminology for the parts of a home computer and we realised that for a non-laptop, non-all-in-one there doesn't seem to be a consensus term for 'the box with all the bits in'. Think classic beige box desktop tower, that bit.
We decided that 'hard drive' would be the best bet for general understanding amongst ourselves, but this niggles my pedantic geekery. What term do you use when you're trying to point someone to 'the bit that actually has the computer in'?