crwdns2934241:0crwdne2934241:0 Em Bowkett

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My MacBook air will not boot up

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When I press the power button the sound of the computer booting up occurs however it only displays a grey computer screen which does not disappear, every time I re-start the computer the same thing happens. Please let me know if you can help.

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MacBook Air 13" Late 2010

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open