If that does not work, when you turn on the computer, hold the "Command" and "S" keys, this should boot to single user mode. When finished, it will dump you to a command prompt. From there type "/sbin/fsck -fy" (no quotes) and press enter. That wil run the BSD Filesystem Check. Once that is complete, type "reboot" and hit enter.
If there was an error with the file system that was keeping you from booting, that will solve it.
You can turn off the machine by pressing and holding the Power button until the display switches off.
Then, try resetting your 'PRAM' using the following instructions;
http://support.apple.com/kb/HT1379
I've used every version of OS X from 10.0 through to 10.5.6 and sometimes you get this problem after an incremental upgrade. It usually just goes away after a couple of reboots.
Please let me know how you go.
Thanks,
Sean
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Hi there,
Try holding down the alt key or option key on your keyboard to select which drive the operating system is located on.
if that doesn't work,
Try holding down the " comand" and "v" keys on your keyboard as it loads, this should load it in verbose mode to troubleshoot it further.
Let me know how it goes.
Hope this helps,
Nathan.
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