have a macbook air with issues. tried to reset OS and now when i power up all i get is flashing ? on a folder? please help!!!

JTIZZLE

Commendable
Aug 1, 2016
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1,510
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got a used macbook air for my sister. it has some power issues. Tried to reset the os at best buy. and it worked till i got home. Now when i power it up all i get is a blank screen with a flashing ? on a folder. Please help.
 

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