Macbook Pro 3.1 not recognize USB boot

[bohatvung]

Hi all.
Need help.
My client have a old Macbook Pro 3.1 Core 2Duo T7500. He installed windows 7 home premium on this then remove original macOS. Now he want to re-install macOS Yosemite. I created a Yosemite usb bootable.
I plugin usb on his Mac, hold Option button but Mac just show windows startup disk and not boot USB with OSX base system.
Thanks.

 

[CoastalOR]

Have you tested the bootable Yosemite USB on another Mac to confirm it works for boot up?

 

[bohatvung]

Have you tested the bootable Yosemite USB on another Mac to confirm it works for boot up?

Yes did it, usb bootable worked on my macbook pro mid 2014.