IMac wont turn on after random shutdown

I was watching a show on my computer and I also had MS word open, and all of a sudden my computer shuts off like it had been unplugged. So I waited a little bit, and tried to turn it on, nothing. So I unplugged it and plugged it back in, and tried to turn it on again, nothing. I've waited for about while now and nothing happens, no noises. I was wondering if anyone has had this problem, or knows anything about it.
Thanks
O

Hi and Welcome to Apple Discussions...
Try Resetting the PRAM
If that didn't help, boot from your install disk, run Disk Utility and make sure the startup disk is ok.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. *Make sure there is always 10% to 15% free disk space*
Carolyn

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