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Please be more specific. But try this. When starting the computer, hold down the D key. It will force it to start up on your internal drives OS X volume. Once the finder has loaded, open system preferences > startup disk > OS X (the one on your internal hard drive it should be the first one in the list. Choose restart. You shouldn't have any problems after this.

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Q: Why does your iMac no long allow you to choose the system you start your mac with?
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