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iMac stuck on white screen and apple logo at st...

My iMac gets stuck on a white screen with an Apple logo and a loading bar. The bar will load all the way after about 5 minutes and then nothing happens. I have read up about shortcuts to do on the keyboard, but my Apple keyboard is wireless and therefore it is not connecting. I do have a PC keyboard I can plug into the computer, but I'm just guessing at the shortcut conversions. Anyone have any ideas regarding how to get my computer fully started up.

最後更新：2017-08-25 13:17:48

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