Hi. I just build a new PC. The spec is CPU : Intel i3-3220, motherboard : MSI Z77MA-G45, graphic card : ASUS GTX 550 Ti DCU Top, power supply 500w, hdd : WD Caviar Blue 1TB. ODD : Liteon DVD Rewriter . The problem is, at the begin my system function normally until today during installation my favourite game its suddenly shut off. When I tried to turn on back, nothing happen. The system not turn on, all fan not spinning. Nothing! I tried to replace the power supply,I got the same result. Its about the motherboard failure,cpu failure or something else? Please help and advice me.