 Compaq Presario 1200 laptops are often found with damaged power jacks.Some of these power jacks appear to have been blown in half due to some sort of short; others rip their copper traces off of the motherboard due to stress placed on the power jack.Presario 1200 laptops typically have four tiny copper rings embedded in the motherboard behind the power jack that can be used to reattach a slightly damaged power jack and repair the failing unit.