My mac won't start at all. Please help urgently. Thanks!

My shockwave was not working. So I decided to quit all programs and restart my mac
It doesn't restart at all.
There is a ding and then it just gies power off.
Tried safe reboot but still the same thing happen.

Did you try booting into your Recovery partition? Hold down the command and R keys whilst booting and if you can get to your Recovery partition use Disk Utility to verify your disk and, if needed, repair the disk.
If it can't be repaired, then it's likely dying.
Clinton

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