I once had a job to do on a PC whereby the owner told me that it was okay until he moved the machine from one room to another, since when it had done nothing! The first thing I noticed when I lifted it up to my table was the weight. It was incredibly heavy. I also noticed a rattle from inside. I asked him exactly what had happened to which he replied the usual "Nothing!" I removed the one screw holding the case on and found scredrivers, spanners, pliers, odd lengths of wire, solder, soldering iron, steel rule, a G-clamp and a pot of Evo-stik inside the case. Most of it was piled up against the motherboard and pressing the various PCI cards out of shape. I asked why he felt it necessary to pack his tool kit inside the computer and was told that if he didn't keep them in there his wife would keep putting them back in his toolbox which was kept in the garage. He liked to keep his 'computer tools' where he had easy access to them. If memory serves me well we managed to salvage the hard drive, cd-rom and floppy and a few cables from the wreckage. Regardless of my advice I know he now wraps his tools (but a lot fewer of them) in a cloth in the case but removes them before bringing me the machine.