My Mac only shows Apple logo at start and then suddenly off

Dear all,
I am freaking out right now. I tried to turn on my iMac. It firstly showed the Apple logo on grey screen. Loading logo appeared below and then suddenly my iMac was off. Any idea what happened?
Wahyu

No, but it sounds like a hardware issue or perhaps a bad hard drive.
If you boot in verbose mode (hold down command-V at boot) do you see some words that indicate where in the process it's failing?

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