My mac os x wont switch on and have checked connections and fuse and they are fine

my mac os x wont switch on and i have checked connections and fuse and they are ok what can i do next

What model of mac are you using?
Verify power outlet works.
Query by serial number
Apple's warrenty database will identify the type of Mac you have.  Your serial number is securely sent.  Provides more information for newer machines.
https://selfsolve.apple.com/agreementWarrantyDynamic.do
This site provides more information.  Best for older machines.  Note, serial number is sent in the clear.
"A serial number is a unique, identifying number or group of numbers and letters assigned to an individual piece of hardware or software. It's used for various things depending on the product / brand but what is your Mac's serial number for and more importantly... what is it hiding and what can it do for you ?"
http://www.appleserialnumberinfo.com/Desktop/index.php

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