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My Mac Pro boots into recovery mode every time it boots up. I have to select the start-up disk when in recovery mode.

How can I make so it starts up in Mac Os X Lion every time without it going into recovery mode?

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up vote 1 down vote accepted

The startup disk system preference is the usual method to set this. As the setting is written to NVRAM, you could also just reset that and the mac should prefer the OS over the Recovery HD

If you can't select the Mac OS X, re-run the lion installer.

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if unaware how to reset PRAM/NVRAM – Dswabster Aug 26 '11 at 18:57
@bmike Thanks it works. I just wonder how it happened in the first place now. – Ginger Bill Aug 26 '11 at 21:38
You can rest assured if there is something systematically setting this - you will have many chances to troubleshoot why. I hope it was simply one value in nvram needing to be refreshed. I wouldn't worry personally - these things sometimes just happen. – bmike Aug 26 '11 at 21:51

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