¿What should I do if my IMac doesn't start?

Yesterday I decided to use my imac so as always I sat down in my chair and pressed the start button but nothing happened.
I looked up at this page for solutions for my problem but they didn't work at all. Please help me!

Hi...
Andrea, we have no way of knowing which solutions you tried that didn't work unless you tell us 
First, try Resetting your Mac's PRAM and NVRAM
If that didn't help, try IResetting the System Management Controller
If nothing above helped, and you don't hear the startup chimes after your press the power button, that means your Mac has not passsed it's startup diagnostics. Take the iMac to an Apple Store or an Apple certified repair provider.
You can make a reservation at the Genius Bar  in advance.

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