Option key can't function to access start up manager, so i can't choose startup disk. please help me

option key can't function to access start up manager, so i can't choose startup disk. please help me

If you have Apple Care, call them and get a case number.  Otherwise, take the computer to an Apple store or an AASP.  Whichever is more convenient for you. 

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    Your expectations are not based in reality.
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