After you have changed the battery, u will have set time /date etc. You may also, depends on mobo, set the fsb, however most boards have this set to 'auto' but older ones dont. Also, if he has an AGOP card, check that this has been set to the primary display device, as when you re-start, i bet it will default to the VGA. Apart from that, not much else springs to mind. ps. u may also have to detect the hardrives again, again, this should be automatic, but older borards require you to go in and set these up.