I`d go for the fuse out of the plug... if you say theres something wrong with the computer for instance
'It started and couldn`t detect the drives, then after a restart it started but wouldn`t post, so you tried again and it showed there was no signal and it wouldn`t even post, then you tried again and it just won`t do anything now'
Because it started a couple of times he`s going to be thinking its the computer and won`t even try the plug. This way theres nothing missing from in the computer, everything is as it should be and he'll declare a dead mobo or something.