Macbook Air won't start up after shutting it down for about 20 minutes

I shut my MBA for about 20 minutes then I tried to turn it on but it won't let me, it is at 49% battery. I pressed the on/off button then waited for about 30 seconds but nothing happened, then i waited for longer and pressed again then it turned on. (I also heard the fans) Can you guys please tell me why this happened and how can I deal with it next time? Thanks a lot.

I would recommend a SMC reset.
SMC RESET
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Roger

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You have to take the computer to the Apple store to have it checked out.
chasoni531 wrote:
One of my questions about the SMC reset was how could the device recognize actions while the computer is powered off?
One of the keys you press when resetting SMC is the power button.

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Hi there abhishekgahlot,
You may want to try resetting the SMC as an initial troubleshooting step. Additionally, take a look at the battery condition. The articles below have more information.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
OS X Mavericks: Battery conditions
http://support.apple.com/kb/PH14197
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Macbook Air won't start up after shutting it down for about 20 minutes

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