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Helpful answers
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Jan 24, 2015 6:18 AM in response to Rahul.TheSharkby dominic23,★HelpfulGo 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
Reset PRAM: http://support.apple.com/kb/PH14222
Best.