I plugged in an external Hard Disk (power off, power supply not connected) by USB to my PC, and suddenly, the whole screen froze, and I couldn't do anything with the keyboard or mouse. Then I pressed the Power button on the PC to restart the computer, but it wouldn't turn on anymore. The fans still work, so it can't be the PS, but I'm wondering whether the CPU or the motherboard died? Has anyone had this problem before? The motherboard is new (only got it a month ago). Config: PS: 480W Motherboard: Inno3D MCP73V Thank you very muchv for any help in advance!