I assembled a new pc just 2 weeks ago, and it did not give me any problems, until yesterday. When i was surfing the internet, my pc all of a sudden shut down by itself. I tried to turn it on by pressing the power button, but the pc just would not turn on. Therefore, I switched off the main power on the power outlet and switched it back on again. This time the pc powered on by itself without even having to press the power button. But after a few seconds, it powered off by itself. Again, i tried to turn it back on by pressing the power button, but there was no response. So I switched off the main power and let the pc "rest" for a few minutes. After the few minutes "rest", I switched on the main power, and again the pc powers on without pressing the power button. I expected it to power off by itself in the next few seconds, but it never and continued to boot up into windows xp. I thought that the pc returned to normal and continued using the pc. But in the end, it let me down and automatically powered off after about 10min.
I wondered what could be the cause of the sudden shutdown, there was no BSOD or any kind of error messages shown before the pc's sudden shutdown. Just before the pc is going to sudden shutdown, i actually noticed that the monitor flickered a bit for half a sec. Could it be the power supply or the motherboard, or other devices? Please help, thank you very much.
CPU: 3.0C GHz Intel P4 Processor
Motherboard: MSI-Neo2 PFS
RAM: 2 X Cosair DDR400 256MB
Power Supply Unit: Super Flower 450W
HD: HITACHI 80GB SATA, MAXTOR 20GB IDE
CD-RW: TDK Internal CDRW
DVD-RW: TDK Internal DVDRW
Casing: Lian Li Aluminium PC06
OS: Windows XP Pro SP2