Background: I have this computer (eMachines T2482) for 2.5 year, and have used it without too heavy or too slight---ordinary and commonly used. Before I powered it on today, it has been closed and rested for 3 days without being touched. Problems: When I pressed the power button today--- 1) NO responses were observed in monitor and keyboard; 2) the power LED on the power button did NOT light on; 3) the CPU fan was powered on and worked; 4) the hard drive LED on the panel lighted on for 10-20 seconds and then turned off automatically; 5) the LEDs on CD-RW and DVD driver flashed for several seconds---like normal; 6) the power button can be used to turn the power off---holding pressing the button for 3~4 seconds. Addition: 1) I have checked the system with a known good power supply, and the response of the system was the same as the case with original power supply; 2) the hard disk have been verified in good situation---all data are there. Questions: Can I know what happened to this computer? Is it the problem of motherboard, or CPU, or power supply? How to get the damaged part replaced? Thank you so much for the help!