After an electrical storm, computer showed no signs power when turned on. Tested power supply, no power, replaced it with a new one of higher wattage. When powered up, computer ran for about 30 sec. and then shut down. Now no sign of power. Tested power supply and am getting some 5 volt readings but no 12 volts. Could this be mother board or hard drive issue? Can on of these kill a power supply? Thanks in advance.