When i turn my macbook air off it won´t turn on again. How do I reset it?

I have a Mac book air, after working on it for a while I will turn it off and then try to turn it on again and it won´t start.
If I wait a while, like an hour, it will come back by itself.
This mal funtion is recurrent. I´ve taken it to the shop for repair and the mal function does not happen to them when they are doing try outs.
How do I reset it?

Go step by step and test.
1. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own"
2.Reset PRAM. http://support.apple.com/kb/PH4405
3. Startup Manager to select Startup disk.
    http://support.apple.com/kb/HT1310
4. Startup in Safe Mode
    http://support.apple.com/kb/PH14204
5.Repair Disk
   Steps 1 through 7
   http://support.apple.com/kb/PH5836

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When i turn my macbook air off it won´t turn on again. How do I reset it?

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