Macbook Air won't start after Yosemite update

Hi all,
I have a late 2013 model macbook air (just out of the 1 year warranty). I updated to Yosemite last night and to complete the install I restarted the macbook when prompted, but it never turned back ok.
I can now hear the macbook trying to start up but it does nothing. I have tried to reset the SMC and I can see the power adapter change colour from orange to green for a few seconds but this does not appear to fix the issue.
Any help is appreciated,
Peter

If that doesn't work, this link may help you identify the problem
https://www.ifixit.com/Wiki/MacBook_Air_Troubleshooting#Section_MacBook_Air_won_ t_turn_on
If you still think its SMC issue you can try manual SMC Reset (At your own risk ). Steps are..
1. Open the lower case
2. Disconnect the battery connector and after few secords connect it back and close the lid
This link may help https://www.ifixit.com/Guide/MacBook+Air+Models+A1237+and+A1304+Battery+Replacem ent/848

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  • Macbook air does not boot after yosemite update

    After latest Yosemite update my Mac book Air is not finishing to reboot, all I see is the white apple on the black screen and the progress bar whch loads slowly and kind of get stuck half the way to the end, and it stays there forever.
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    To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
    Step 1
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