My MacBook Air (2013) won't turn on

This morning I was using it, and it was working fine. I came home this evening, plugged my MacBook into the MagSafe power adapter and went to power it on - and nothing happened. It is responding to the power adapter (ie lights up green initially and the orange) but I cannot get it to respond. At one stage I did hear a brief chime as if it was rebooting, but it cut off again.
I have tried everything I can find online - holding down the power button, holding down power, option and command, etc but nothing is working. I have only owned this laptop for a couple of months and I cannot think of anything that would have damaged it. As I say, it as working this morning.
I am desperate for help as I am currently abroad and not near an Apple Store and my laptop is essential for the work I am doing so any help would be greatly appreciated.

I have only owned this laptop for a couple of months
The good news is that is still under the one year limited warranty.
Startup your Mac in Safe Mode
A Safe Mode boot takes a longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple () menu.
If that doesn't help, see if you can access OS X Recovery.
Turn the Mac off, wait about ten seconds then startup while holding down the Command + R keys. Let go of the keys when you see the spinning progress indicator.
From there you should be able to access the utilities in recovery mode to verify and repair the disk if necesssary, or reinstal OS X.
Read before proceeding >  OS X: About OS X Recovery
If you can't boot into recovery mode, contact Apple for instructions for sending in your Mac for service > Contact Us - Apple Store

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