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Jan 12, 2015 9:05 AM in response to jalibfromsloughby dominic23,Go step by step and test.
http://support.apple.com/kb/ts1440
Startup Manager to select Startup disk.
http://support.apple.com/kb/HT1310
Repair Disk Section: "Try Disk Utility"
http://support.apple.com/en-us/HT203176
Reinstall OS X