My sony vio is not starting up

Hi there, This my indicate quite a few hardware issues but to start,
If you have an expansion card requires its own molex connection to the power supply this may be the problem if the card isn't getting enough power or is unplugged. check and make sure all power cords are plugged in and not coming loose on the mobo and all other components, If you have access to another Power supply try swapping your power supply for a different one. i hope this helps and good luck.