Always boots to partition selection...

i don't know if describing properly, time ago, every time reboot imac not boot straight log in page. instead brings me screen shows 3 partitions (mac, recovery, , boot camp) , below shows wireless network. in order me boot mac have click on arrow under particular partition. go away , boot straight log in page.

in advance.

 

go system preferences, startup disk, select disk want boot disk, reboot , should go.

 

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