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I have a MacBook Pro and run Windows XP on it too much however I cannot remember how I can open the MacBook Pro with OS X on instead of Windows XP. How can I boot back to OS X?

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Hold ⌥ on boot and select your OS X partition. This changes your boot partition once for that time you boot.

If you want to change it permanently, boot to OS X, open System Preferences → Startup Disk and select your OS X partition, or boot to Windows, open the Boot Camp Control Panel and select the OS X partition as the boot partition. Then, you will need to ⌥-boot to boot to Windows.

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I also believe there is a control panel in Windows that let you choose the startup disk. – Édouard Apr 12 '14 at 19:58
@Édouard Indeed — forgot about that – grgarside Apr 12 '14 at 20:00
That control panel can be uninstalled though. – ash Apr 14 '14 at 3:57

You have to Hold option key upon start up, two HDD will apperas, select the bootcamp disk or windows disk and you are done.

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