appropriate uses of duct tape

We have here a Dell (R) Dimension data processor  --  a marvelous machine acquired at a reduced price using a periodical ad, that required about $50 worth of expert work to make it functional (again).  However, only one loosened screw from this processor causes the entire external housing to part company with the internal machinery, such that duct tape now holds it around the functional data-storage-and-processing mechanism.