Did you get the mechanism back properly? The larger-than-usual keys (spacebar, return, backspace, shift, etc.) often have a small wire "spring" which has to be fitted just right so that the key operates smoothly no matter which end you press it.
People have enough fun trying to get keyboards to work properly here as it is. If they forget to configure the system for a British keyboard, £ gives #, " gives @, and so on.
