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Helpful answers
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Nov 7, 2013 4:55 PM in response to 7vanessaby sanjampet,First make sure the batteries are good and the device is turned on.
You can try a SMC reset:
http://support.apple.com/kb/HT3964
Also try a NVRAM/PRAM reset:
Power off, power on holding OPTION + COMMAND + P + R
hold until you hear the start chime 2 times then release, reboot
Try checking here, maybe some help:
http://support.apple.com/kb/TS3048
http://support.apple.com/kb/HT2845