hi im been recaseing my dads pc in to a custom case everythink connected its a pentium d was booting up fine den started to boot then conks out? likee it shorts? i think i might have put the wrong power led hard drive light etc switches in wrong connectors would this cause this?took heat sink of den den back on .den went all funny boots den stops and the power gos ive checked that the heat sink is placed proply and it is the motherboard is a factory motherboard fujitsu siemans that have not got the plugs etc highlighed with what they are i new all of them eccept the power leds etc cos there coulour coded but dont match the new case??? what could cause the power conking? p.s its not the power supply!