IMAC OSX install help?


i got couple of years old imac installed windows on , deleted osx partition!
i’m trying make boot yosemite usb ext drive install or access cmd-r can format , restore no luck. thought apple bt keyboard , mouse isn’t connected tried windows usb keyboard, still boots after grey screen boots right windows.

ideas please?
 

have external drive connected , turned on.

reboot , hold down option key hear startup sound, , keep holding down.

startup manager should appear, showing volumes can boot.

see external usb volume? if so, select pointer , hit return.

better?
 


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