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Does the mac still power on ok? When you say it can't restart, do you get to a black screen only or does the apple icon even show up on the screen or the loading progress bar? Either way you can try and boot the mac into whats called "recovery mode" and reinstall the OS which does not delete your data.
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It has been a couple days without a response so I will release this question to other experts in hopes that you may return at a later time.
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