Bad hard drive, bad memory, bad video graphics.
You need to test every component of your system.
Any power supply that has blown fuses and puffed capacitors has usually done a long of damage... There is just no way to know if a motherboard or other component blew the power supply, or if the power supply blew the motherboard. We always think the power supply went by itself, but often it is ruined by the failure of something else.