Which exact model are these? Have you checked for the market for parts for these? You most likely would still break down most of them but on some older models there is a limited market for parts. Do yourself a favor and determine if there is a market. Testing the parts before you break them down is the easiest way to go. If you don't have a good hard drive with OS then get a copy of a 32 bit copy of one of the Linux OS. Ubuntu, Linux lime, Kubuntu, Linux lite. Lots to choose from and they are all free. Good luck, Mike